Depends on what your language's script is then with assigned Unicode characters, how wide-spread it is, when fonts will support the glyphs, and what you mean by "changes to be available on my local OS". What OS? What does available mean here? Do you expect the OS UI to be in your language? Doubtful. Some desktop environment maybe somewhen. Programs using ICU are more likely to support specific script related features (e.g. word/line breaking, transliteration) when ICU will support Unicode 16 in its next version. Locale specifics may have to wait for or could be contributed to CLDR that is also used by ICU. Availability of any UI in the language mostly depends on whether translators contribute to the relevant projects.
Making one a maintainer (with merge and possibly even direct commit/push permissions) is handing them a key to the kingdom. Recruiting a maintainer out of the blue without them being already contributor and long term participant in the project is questionable.
Malicious account holders with a long term goal need to build reputation. It doesn't matter much that such an app isn't a dependency of other software.
First choice GIMP. Then, Digikam has an image editor that provides a number of tools. Not as detailed and sophisticated as GIMP but does most things needed.
Meh, not available in Android versions :-/
You could disable deletion of cookies and site data, and use the Cookie AutoDelete Add-On to delete cookies and data (you'll have to enable that once) and add sites you want to keep there in the whitelist while you are visiting them.
If you like command line: TaskWarrior has due and recurring tasks and weighted priorities and more.
There are also some frontends under Tools, search for GUI, but to me they are more cumbersome than CLI. If you're into Vim then vit might come handy.
In F-Droid https://f-droid.org/en/packages/com.google.android.stardroid/