The "showNsfw" filter could only filter for either all sources or sources that aren't nsfw.
The "pinned" and "enabled" filtered behaved similarly, but at the same time they were also completely buggy.
E.g. "pinned = false" just returned all sources including pinned ones.
The local source is always shown, and therefore its language ("other") should only be shown in the language filter in case an actual source is installed that supports is of "other" language.
Switch to "lingui" for better DX.
Tried to persist existing languages as much as possible.
Removed "vite-plugin-node-polyfills" because it's incompatible with "lingui"
