Hello,
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reduce /usr/share/locale
Here is my stab at an answer
This list deletes everything not english, proceed with caution, adjust to those language you won’t use only.
cd /usr/share/local ; rm -rf ab ace ach af ain ak am an ang ar as ast ay az az_IR ba bal bar be be@latin bg bi bn bn_BD bn_IN bo br bs byn ca ca@valencia ce ch chr ckb crh cs csb cs_CZ cv cy da de de_CH de_DE de@hebrew dv dz ee el en en@arabic en_AU en@cyrillic en@greek en@hebrew en_NZ en@piglatin en@shaw eo es es_ES es_EU es_MX et eu fa ff fi fil fo fr frp fur fy ga gd gez gl gn gu gv ha haw he hi hr ht hu hu_HU hy ia id id_ID ie io is it iu ja jam ka kab kg ki kk kl km kmr kn ko kok ku kv kw kw_GB ky lg li lo lt lv mai mg mhr mi mjw mk ml mn mo mr ms mt my na nah nb nb_NO nds ne nl nl_BE nl_NL nn no nso nv oc or pa pap pa_PK pi pl ps pt pt_BR pt_PT ro rom ro_MD ru ru_UA rw sc sd si sk sl so son sq sr sr@ije sr@latin sr@Latn sv sw ta te tg th ti tig tk tl tr tt tt@iqtelif tzm ug uk ur uz uz@cyrillic ve vi wa wal wo xh yi yo zh_CN zh_Hans zh_Hant zh_HK zh_TW zu
To run it at every boot, run the following command
echo "rm -rf rm -rf ab ace ach af ain ak am an ang ar as ast ay az az_IR ba bal bar be be@latin bg bi bn bn_BD bn_IN bo br bs byn ca ca@valencia ce ch chr ckb crh cs csb cs_CZ cv cy da de de_CH de_DE de@hebrew dv dz ee el en en@arabic en_AU en@cyrillic en@greek en@hebrew en_NZ en@piglatin en@shaw eo es es_ES es_EU es_MX et eu fa ff fi fil fo fr frp fur fy ga gd gez gl gn gu gv ha haw he hi hr ht hu hu_HU hy ia id id_ID ie io is it iu ja jam ka kab kg ki kk kl km kmr kn ko kok ku kv kw kw_GB ky lg li lo lt lv mai mg mhr mi mjw mk ml mn mo mr ms mt my na nah nb nb_NO nds ne nl nl_BE nl_NL nn no nso nv oc or pa pap pa_PK pi pl ps pt pt_BR pt_PT ro rom ro_MD ru ru_UA rw sc sd si sk sl so son sq sr sr@ije sr@latin sr@Latn sv sw ta te tg th ti tig tk tl tr tt tt@iqtelif tzm ug uk ur uz uz@cyrillic ve vi wa wal wo xh yi yo zh_CN zh_Hans zh_Hant zh_HK zh_TW zu" | sudo tee /usr/local/cleanlocale.sh > /dev/null
echo "[Unit]
Description=Clean locale
#After=network.target
[Service]
Type=oneshot
ExecStart=/usr/local/cleanlocale.sh
RemainAfterExit=true
StandardOutput=journal
[Install]
WantedBy=multi-user.target" | sudo tee /etc/systemd/system/cleanlocale.service > /dev/null
sudo systemctl enable --now cleanlocale.service
based on Need to run command at startup - #2 by Mirdarthos
Bonus round, you can save another 150M by
cd /usr/share/dict
rm -rf bokmaal brazilian bulgarian catalan danish dutch french italian nederlands ngerman norsk nynorsk polish portuguese spanish svenska swedish