I noticed some weirdness I never see those messages before. Here is my update log
:: Exécution des crochets de pré-transaction…
(1/4) Removing linux initcpios...
(2/4) Remove Firefox Distribution Settings
(3/4) Save Linux kernel modules
(4/4) Remove Thunderbird Distribution Settings
:: Traitement des changements du paquet…
( 1/126) mise à jour de libjpeg-turbo [----------------------------------------------------------] 100%
( 2/126) mise à jour de iana-etc [----------------------------------------------------------] 100%
( 3/126) mise à jour de glibc [----------------------------------------------------------] 100%
Generating locales...
Generation complete.
( 4/126) mise à jour de sqlite [----------------------------------------------------------] 100%
( 5/126) mise à jour de md4c [----------------------------------------------------------] 100%
( 6/126) mise à jour de harfbuzz [----------------------------------------------------------] 100%
( 7/126) mise à jour de libxcrypt [----------------------------------------------------------] 100%
( 8/126) mise à jour de libcap [----------------------------------------------------------] 100%
( 9/126) mise à jour de libgpg-error [----------------------------------------------------------] 100%
( 10/126) mise à jour de systemd-libs [----------------------------------------------------------] 100%
( 11/126) mise à jour de libcap-ng [----------------------------------------------------------] 100%
( 12/126) mise à jour de libedit [----------------------------------------------------------] 100%
( 13/126) mise à jour de llvm-libs [----------------------------------------------------------] 100%
( 14/126) mise à jour de vulkan-icd-loader [----------------------------------------------------------] 100%
( 15/126) mise à jour de libpsl [----------------------------------------------------------] 100%
( 16/126) mise à jour de xorg-server-common [----------------------------------------------------------] 100%
( 17/126) mise à jour de systemd [----------------------------------------------------------] 100%
( 18/126) mise à jour de xorg-server [----------------------------------------------------------] 100%
( 19/126) mise à jour de qt5-base [----------------------------------------------------------] 100%
( 20/126) mise à jour de qt5-declarative [----------------------------------------------------------] 100%
( 21/126) mise à jour de accounts-qml-module [----------------------------------------------------------] 100%
( 22/126) mise à jour de accountsservice [----------------------------------------------------------] 100%
( 23/126) mise à jour de amd-ucode [----------------------------------------------------------] 100%
( 24/126) mise à jour de libksba [----------------------------------------------------------] 100%
( 25/126) mise à jour de gnupg [----------------------------------------------------------] 100%
( 26/126) mise à jour de ark [----------------------------------------------------------] 100%
( 27/126) mise à jour de kdecoration [----------------------------------------------------------] 100%
( 28/126) mise à jour de breeze [----------------------------------------------------------] 100%
( 29/126) mise à jour de cfitsio [----------------------------------------------------------] 100%
( 30/126) mise à jour de libssh [----------------------------------------------------------] 100%
( 31/126) mise à jour de chromaprint [----------------------------------------------------------] 100%
( 32/126) mise à jour de imagemagick [----------------------------------------------------------] 100%
( 33/126) mise à jour de liblouis [----------------------------------------------------------] 100%
( 34/126) mise à jour de cups-filters [----------------------------------------------------------] 100%
( 35/126) mise à jour de discount [----------------------------------------------------------] 100%
( 36/126) mise à jour de gettext [----------------------------------------------------------] 100%
( 37/126) mise à jour de exiv2 [----------------------------------------------------------] 100%
( 38/126) mise à jour de dolphin [----------------------------------------------------------] 100%
( 39/126) mise à jour de editorconfig-core-c [----------------------------------------------------------] 100%
( 40/126) mise à jour de f2fs-tools [----------------------------------------------------------] 100%
( 41/126) mise à jour de firefox [----------------------------------------------------------] 100%
( 42/126) mise à jour de firefox-i18n-en-us [----------------------------------------------------------] 100%
( 43/126) mise à jour de firefox-i18n-fr [----------------------------------------------------------] 100%
( 44/126) mise à jour de glusterfs [----------------------------------------------------------] 100%
-- Read https://gluster.readthedocs.io/en/latest/Upgrade-Guide/ page!
( 45/126) mise à jour de harfbuzz-icu [----------------------------------------------------------] 100%
( 46/126) mise à jour de htop [----------------------------------------------------------] 100%
( 47/126) mise à jour de iw [----------------------------------------------------------] 100%
( 48/126) mise à jour de kactivitymanagerd [----------------------------------------------------------] 100%
( 49/126) mise à jour de kde-cli-tools [----------------------------------------------------------] 100%
( 50/126) mise à jour de kde-gtk-config [----------------------------------------------------------] 100%
( 51/126) mise à jour de libksysguard [----------------------------------------------------------] 100%
( 52/126) mise à jour de milou [----------------------------------------------------------] 100%
( 53/126) mise à jour de kscreenlocker [----------------------------------------------------------] 100%
( 54/126) mise à jour de kwayland-server [----------------------------------------------------------] 100%
( 55/126) mise à jour de kwin [----------------------------------------------------------] 100%
( 56/126) mise à jour de qqc2-desktop-style [----------------------------------------------------------] 100%
( 57/126) mise à jour de plasma-integration [----------------------------------------------------------] 100%
( 58/126) mise à jour de libkscreen [----------------------------------------------------------] 100%
( 59/126) mise à jour de qrencode [----------------------------------------------------------] 100%
( 60/126) mise à jour de plasma-workspace [----------------------------------------------------------] 100%
( 61/126) mise à jour de kdeplasma-addons [----------------------------------------------------------] 100%
( 62/126) mise à jour de kgamma5 [----------------------------------------------------------] 100%
( 63/126) mise à jour de khotkeys [----------------------------------------------------------] 100%
( 64/126) mise à jour de systemsettings [----------------------------------------------------------] 100%
( 65/126) mise à jour de kinfocenter [----------------------------------------------------------] 100%
( 66/126) mise à jour de kmenuedit [----------------------------------------------------------] 100%
( 67/126) mise à jour de knetattach [----------------------------------------------------------] 100%
( 68/126) mise à jour de kscreen [----------------------------------------------------------] 100%
( 69/126) mise à jour de ksshaskpass [----------------------------------------------------------] 100%
( 70/126) mise à jour de ksysguard [----------------------------------------------------------] 100%
( 71/126) mise à jour de socat [----------------------------------------------------------] 100%
( 72/126) mise à jour de kwallet-pam [----------------------------------------------------------] 100%
( 73/126) mise à jour de kwayland-integration [----------------------------------------------------------] 100%
( 74/126) mise à jour de kwrited [----------------------------------------------------------] 100%
( 75/126) mise à jour de lib32-glibc [----------------------------------------------------------] 100%
( 76/126) mise à jour de lib32-gettext [----------------------------------------------------------] 100%
( 77/126) mise à jour de lib32-harfbuzz [----------------------------------------------------------] 100%
( 78/126) mise à jour de lib32-libcap [----------------------------------------------------------] 100%
( 79/126) mise à jour de lib32-libx11 [----------------------------------------------------------] 100%
( 80/126) mise à jour de lib32-sqlite [----------------------------------------------------------] 100%
( 81/126) installation de lib32-libxcrypt [----------------------------------------------------------] 100%
( 82/126) mise à jour de lib32-systemd [----------------------------------------------------------] 100%
( 83/126) mise à jour de lib32-vulkan-icd-loader [----------------------------------------------------------] 100%
( 84/126) mise à jour de libao [----------------------------------------------------------] 100%
( 85/126) mise à jour de libde265 [----------------------------------------------------------] 100%
( 86/126) mise à jour de libheif [----------------------------------------------------------] 100%
( 87/126) mise à jour de libmpdclient [----------------------------------------------------------] 100%
( 88/126) mise à jour de linux-firmware [----------------------------------------------------------] 100%
( 89/126) mise à jour de linux54 [----------------------------------------------------------] 100%
( 90/126) mise à jour de linux54-nvidia-450xx [----------------------------------------------------------] 100%
( 91/126) mise à jour de linux54-virtualbox-host-modules [----------------------------------------------------------] 100%
In order to use the new version, reload all virtualbox modules manually.
( 92/126) mise à jour de linux57 [----------------------------------------------------------] 100%
>>> NOTE, 5.7.19 was the last maintenance release by Greg Kroah-Hartman.
This kernel series is now marked EOL (end of life).
It is recommend to move on to linux58 series.
Use followed cmd to do that: 'sudo mhwd-kernel -i linux58'
( 93/126) mise à jour de linux57-nvidia-450xx [----------------------------------------------------------] 100%
( 94/126) mise à jour de linux57-virtualbox-host-modules [----------------------------------------------------------] 100%
In order to use the new version, reload all virtualbox modules manually.
( 95/126) mise à jour de mpd [----------------------------------------------------------] 100%
( 96/126) mise à jour de mujs [----------------------------------------------------------] 100%
( 97/126) mise à jour de ntfs-3g [----------------------------------------------------------] 100%
( 98/126) mise à jour de openssh [----------------------------------------------------------] 100%
( 99/126) mise à jour de pamac-common [----------------------------------------------------------] 100%
(100/126) mise à jour de pamac-cli [----------------------------------------------------------] 100%
(101/126) mise à jour de xdg-desktop-portal-kde [----------------------------------------------------------] 100%
(102/126) mise à jour de pamac-flatpak-plugin [----------------------------------------------------------] 100%
(103/126) mise à jour de pamac-gtk [----------------------------------------------------------] 100%
(104/126) mise à jour de pamac-snap-plugin [----------------------------------------------------------] 100%
(105/126) mise à jour de pamac-tray-icon-plasma [----------------------------------------------------------] 100%
(106/126) mise à jour de perl-html-parser [----------------------------------------------------------] 100%
(107/126) mise à jour de perl-path-tiny [----------------------------------------------------------] 100%
(108/126) mise à jour de polkit-kde-agent [----------------------------------------------------------] 100%
(109/126) mise à jour de plasma-desktop [----------------------------------------------------------] 100%
(110/126) mise à jour de plasma-nm [----------------------------------------------------------] 100%
(111/126) mise à jour de plasma-pa [----------------------------------------------------------] 100%
(112/126) mise à jour de powerdevil [----------------------------------------------------------] 100%
(113/126) mise à jour de python-pyqt5-sip [----------------------------------------------------------] 100%
(114/126) mise à jour de python-sip [----------------------------------------------------------] 100%
(115/126) mise à jour de s-nail [----------------------------------------------------------] 100%
(116/126) mise à jour de sddm-kcm [----------------------------------------------------------] 100%
(117/126) mise à jour de smartmontools [----------------------------------------------------------] 100%
(118/126) mise à jour de spirv-tools [----------------------------------------------------------] 100%
(119/126) mise à jour de systemd-sysvcompat [----------------------------------------------------------] 100%
(120/126) mise à jour de thunderbird [----------------------------------------------------------] 100%
(121/126) mise à jour de thunderbird-i18n-en-us [----------------------------------------------------------] 100%
(122/126) mise à jour de thunderbird-i18n-fr [----------------------------------------------------------] 100%
(123/126) mise à jour de user-manager [----------------------------------------------------------] 100%
(124/126) mise à jour de whois [----------------------------------------------------------] 100%
(125/126) mise à jour de wine [----------------------------------------------------------] 100%
(126/126) mise à jour de xapian-core [----------------------------------------------------------] 100%
:: Exécution des crochets de post-transaction…
( 1/24) Creating system user accounts...
( 2/24) Registering binary formats...
( 3/24) Updating journal message catalog...
( 4/24) Reloading system manager configuration...
( 5/24) Updating udev hardware database...
( 6/24) Applying kernel sysctl settings...
Not setting net/ipv4/conf/all/rp_filter (explicit setting exists).
Not setting net/ipv4/conf/default/rp_filter (explicit setting exists).
Not setting net/ipv4/conf/all/accept_source_route (explicit setting exists).
Not setting net/ipv4/conf/default/accept_source_route (explicit setting exists).
Not setting net/ipv4/conf/all/promote_secondaries (explicit setting exists).
Not setting net/ipv4/conf/default/promote_secondaries (explicit setting exists).
( 7/24) Creating temporary files...
( 8/24) Reloading device manager configuration...
( 9/24) Arming ConditionNeedsUpdate...
(10/24) Updating module dependencies...
(11/24) Restarting cronie for libc upgrade...
(12/24) Updating linux initcpios...
==> Building image from preset: /etc/mkinitcpio.d/linux54.preset: 'default'
-> -k /boot/vmlinuz-5.4-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.4-x86_64.img
==> Starting build: 5.4.61-1-MANJARO
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [autodetect]
-> Running build hook: [modconf]
-> Running build hook: [block]
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
/etc/locale.conf: line 7: warning: setlocale: LC_NUMERIC: cannot change locale (fr_FR.UTF-8): No such file or directory
/etc/locale.conf: line 10: warning: setlocale: LC_TIME: cannot change locale (fr_FR.UTF-8): No such file or directory
-> Running build hook: [filesystems]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.4-x86_64.img
bsdtar: Failed to set default locale
bsdtar: Failed to set default locale
==> Image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux54.preset: 'fallback'
-> -k /boot/vmlinuz-5.4-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.4-x86_64-fallback.img -S autodetect
==> Starting build: 5.4.61-1-MANJARO
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [modconf]
-> Running build hook: [block]
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
/etc/locale.conf: line 7: warning: setlocale: LC_NUMERIC: cannot change locale (fr_FR.UTF-8): No such file or directory
/etc/locale.conf: line 10: warning: setlocale: LC_TIME: cannot change locale (fr_FR.UTF-8): No such file or directory
-> Running build hook: [filesystems]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.4-x86_64-fallback.img
bsdtar: bsdtar: Failed to set default localeFailed to set default locale
==> Image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux57.preset: 'default'
-> -k /boot/vmlinuz-5.7-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.7-x86_64.img
==> Starting build: 5.7.19-2-MANJARO
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [autodetect]
-> Running build hook: [modconf]
-> Running build hook: [block]
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
/etc/locale.conf: line 7: warning: setlocale: LC_NUMERIC: cannot change locale (fr_FR.UTF-8): No such file or directory
/etc/locale.conf: line 10: warning: setlocale: LC_TIME: cannot change locale (fr_FR.UTF-8): No such file or directory
-> Running build hook: [filesystems]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.7-x86_64.img
bsdtar: Failed to set default locale
bsdtar: Failed to set default locale
==> Image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux57.preset: 'fallback'
-> -k /boot/vmlinuz-5.7-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.7-x86_64-fallback.img -S autodetect
==> Starting build: 5.7.19-2-MANJARO
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [modconf]
-> Running build hook: [block]
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
/etc/locale.conf: line 7: warning: setlocale: LC_NUMERIC: cannot change locale (fr_FR.UTF-8): No such file or directory
/etc/locale.conf: line 10: warning: setlocale: LC_TIME: cannot change locale (fr_FR.UTF-8): No such file or directory
-> Running build hook: [filesystems]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.7-x86_64-fallback.img
bsdtar: Failed to set default locale
bsdtar: Failed to set default locale
==> Image generation successful
(13/24) Updating Kernel initcpios for Nvidia-DRM...
==> Building image from preset: /etc/mkinitcpio.d/linux54.preset: 'default'
-> -k /boot/vmlinuz-5.4-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.4-x86_64.img
==> Starting build: 5.4.61-1-MANJARO
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [autodetect]
-> Running build hook: [modconf]
-> Running build hook: [block]
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
/etc/locale.conf: line 7: warning: setlocale: LC_NUMERIC: cannot change locale (fr_FR.UTF-8): No such file or directory
/etc/locale.conf: line 10: warning: setlocale: LC_TIME: cannot change locale (fr_FR.UTF-8): No such file or directory
-> Running build hook: [filesystems]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.4-x86_64.img
bsdtar: Failed to set default locale
bsdtar: Failed to set default locale
==> Image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux54.preset: 'fallback'
-> -k /boot/vmlinuz-5.4-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.4-x86_64-fallback.img -S autodetect
==> Starting build: 5.4.61-1-MANJARO
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [modconf]
-> Running build hook: [block]
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
/etc/locale.conf: line 7: warning: setlocale: LC_NUMERIC: cannot change locale (fr_FR.UTF-8): No such file or directory
/etc/locale.conf: line 10: warning: setlocale: LC_TIME: cannot change locale (fr_FR.UTF-8): No such file or directory
-> Running build hook: [filesystems]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.4-x86_64-fallback.img
bsdtar: Failed to set default locale
bsdtar: Failed to set default locale
==> Image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux57.preset: 'default'
-> -k /boot/vmlinuz-5.7-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.7-x86_64.img
==> Starting build: 5.7.19-2-MANJARO
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [autodetect]
-> Running build hook: [modconf]
-> Running build hook: [block]
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
/etc/locale.conf: line 7: warning: setlocale: LC_NUMERIC: cannot change locale (fr_FR.UTF-8): No such file or directory
/etc/locale.conf: line 10: warning: setlocale: LC_TIME: cannot change locale (fr_FR.UTF-8): No such file or directory
-> Running build hook: [filesystems]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.7-x86_64.img
bsdtar: Failed to set default locale
bsdtar: Failed to set default locale
==> Image generation successful
==> Building image from preset: /etc/mkinitcpio.d/linux57.preset: 'fallback'
-> -k /boot/vmlinuz-5.7-x86_64 -c /etc/mkinitcpio.conf -g /boot/initramfs-5.7-x86_64-fallback.img -S autodetect
==> Starting build: 5.7.19-2-MANJARO
-> Running build hook: [base]
-> Running build hook: [udev]
-> Running build hook: [modconf]
-> Running build hook: [block]
-> Running build hook: [keyboard]
-> Running build hook: [keymap]
/etc/locale.conf: line 7: warning: setlocale: LC_NUMERIC: cannot change locale (fr_FR.UTF-8): No such file or directory
/etc/locale.conf: line 10: warning: setlocale: LC_TIME: cannot change locale (fr_FR.UTF-8): No such file or directory
-> Running build hook: [filesystems]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.7-x86_64-fallback.img
bsdtar: Failed to set default locale
bsdtar: Failed to set default locale
==> Image generation successful
(14/24) Updating Grub-Bootmenu
Generating grub configuration file ...
Found theme: /boot/grub/themes/pacbang/theme.txt
Found linux image: /boot/vmlinuz-5.7-x86_64
Found initrd image: /boot/amd-ucode.img /boot/initramfs-5.7-x86_64.img
Found initrd fallback image: /boot/initramfs-5.7-x86_64-fallback.img
Found linux image: /boot/vmlinuz-5.4-x86_64
Found initrd image: /boot/amd-ucode.img /boot/initramfs-5.4-x86_64.img
Found initrd fallback image: /boot/initramfs-5.4-x86_64-fallback.img
Found Windows Boot Manager on /dev/sdc1@/efi/Microsoft/Boot/bootmgfw.efi
Adding boot menu entry for UEFI Firmware Settings ...
done
(15/24) Reloading system bus configuration...
(16/24) Warn about old perl modules
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = "",
LC_ALL = (unset),
LC_ADDRESS = "fr_FR.UTF-8",
LC_NAME = "fr_FR.UTF-8",
LC_MONETARY = "fr_FR.UTF-8",
LC_PAPER = "fr_FR.UTF-8",
LC_IDENTIFICATION = "fr_FR.UTF-8",
LC_TELEPHONE = "fr_FR.UTF-8",
LC_MEASUREMENT = "fr_FR.UTF-8",
LC_TIME = "fr_FR.UTF-8",
LC_NUMERIC = "fr_FR.UTF-8",
LANG = "fr_FR.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
(17/24) Copy Firefox Distribution Settings
(18/24) Probing GDK-Pixbuf loader modules...
(19/24) Updating icon theme caches...
(20/24) Restore Linux kernel modules
==> Warning:
-> Kernel has been updated. Modules of the current kernel
-> have been backed up so you can continue to use your
-> computer. However, the new kernel will only work
-> at next boot.
(21/24) Updating the info directory file...
(22/24) Copy Thunderbird Distribution Settings
(23/24) Updating the desktop file MIME type cache...
(24/24) Updating the MIME type database...
Here are some parts from the log that look weird to me, never had locale issues before (the sysctl settings part is not about locale though but I still added it as it may be something to look at but seems harmless):
( 6/24) Applying kernel sysctl settings...
Not setting net/ipv4/conf/all/rp_filter (explicit setting exists).
Not setting net/ipv4/conf/default/rp_filter (explicit setting exists).
Not setting net/ipv4/conf/all/accept_source_route (explicit setting exists).
Not setting net/ipv4/conf/default/accept_source_route (explicit setting exists).
Not setting net/ipv4/conf/all/promote_secondaries (explicit setting exists).
Not setting net/ipv4/conf/default/promote_secondaries (explicit setting exists).
-> Running build hook: [keymap]
/etc/locale.conf: line 7: warning: setlocale: LC_NUMERIC: cannot change locale (fr_FR.UTF-8): No such file or directory
/etc/locale.conf: line 10: warning: setlocale: LC_TIME: cannot change locale (fr_FR.UTF-8): No such file or directory
==> Creating gzip-compressed initcpio image: /boot/initramfs-5.4-x86_64.img
bsdtar: Failed to set default locale
bsdtar: Failed to set default locale
(16/24) Warn about old perl modules
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = "",
LC_ALL = (unset),
LC_ADDRESS = "fr_FR.UTF-8",
LC_NAME = "fr_FR.UTF-8",
LC_MONETARY = "fr_FR.UTF-8",
LC_PAPER = "fr_FR.UTF-8",
LC_IDENTIFICATION = "fr_FR.UTF-8",
LC_TELEPHONE = "fr_FR.UTF-8",
LC_MEASUREMENT = "fr_FR.UTF-8",
LC_TIME = "fr_FR.UTF-8",
LC_NUMERIC = "fr_FR.UTF-8",
LANG = "fr_FR.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
EDIT: I went to my system regional settings and something is fishy, like no language appear to be installed at all, same in the detailed settings. YOLO, I reboot and check back lol.
EDIT 2: After reboot same situation I have no longer any language installed when I look into Regional Setting in KDE. I then added back French and English language to the system… Really weird as the system after reboot was still in French everywhere. Not sure what’s going on, but reinstalling manually locales from KDE System Settings seems to make the previously installed locales show again properly there.
I’m tempted to restore a backup to investigate and see if I can reproduce the issue (or if the issue wasn’t there before but I doubt it). Will wait for others to report here first, maybe I’m not alone seeing these message and weirdness.