Manjaro, NVidia Gtx 660
Wows and mods installed through lutris
Same 1&2 errors as OP
Installer claims that no game client is recognized although almost all mods install correctly
Icons from info panels, self and enemy, and icons from side panels are missing.
https://cdn.discordapp.com/attachments/477424933656461322/717339877435375666/unknown.png
Torpedo warning sounds do not work
Once, i had an issue with fonts, where all characters in the game client turned from english to question marks but that got resolved a few modpack updates later.
I believe the font.zip was failing to either extract or move the fonts to their proper location.
Side comment:
The dev of wows-monitor mod was kind enough to provide me with a native executable for linux!
We had a talk about him supporting major linux distros but he claimed there was only 1 person using his mod in linux.
He requested that if i ever find more people using linux in need of his mod to send them over to his discord: https://discord.gg/Tds7WBs so i shamelessly leave this here :P