Some supported languages doesn't have proper font

Issue is not resolved despite the status. Mods, please update the status.

Resolution: Works As Intended

I don't see why this may be intended. Could you name a reason?
I have a few why it's not.

I didn't resolve it as such, yet I'm not going to reopen it either.

How do I summon a guy who did it?

Why not resolve it properly? Is it just because dev's don't want to mess with alphabets they don't understand, or afraid to make a mistake in foreign language? Just involve the community into it. There is plenty of hand-made translations that resolve this issue. In fact, this "feature" is the only reason why these translations even exist.
https://www.google.com/search?newwindow=1&biw=1280&bih=904&tbm=isch&sa=1&q=minecraft+glyph_04.png&oq=minecraft+glyph_04.png

The reason the unicode font exists is specifically because the normal font does not cover all required characters. That is why I resolved this ticket as WAI.

But it can cover, there is a texture files in the assets. You can even google already done textures for every language.

Adding default font variants for every character would be a feature request. Are you saying there already exist default font variants for some currently unicode font-only characters in the vanilla minecraft.jar?

There is a difference between "every character" (yes, that would be a feature request) and characters from officially supported languages. That doesn't mean that deafult fount should support stuff like emoji. What is does mean that all supported languages should have the same look like the default language (currently they're not and this is not intended behavior therefore its bug).

Pyotr is making quite wide assumptions in order to get into declaring this as a bug. Especially consider that "Officially supported language" could mean just translations, instead of including also proprietary full unicode font rendering. (Note, even if not all glyphs of unicode would need to be supported, all the text in Minecraft is unicode encoded and handling even basics of its rendering is a big project in itself. And since OS/graphics engine already does that well, why bother reinventing the wheel.)

You can make all languages look like default language by enforcing unicode rendering. Or more correctly, even default ASCII characters are then rendered the same way as other characters are.

Considering how large a change (not a fix) the support for more than 256 glyphs by the game's internal renderer would be (yes, required for pretty much anything else than select few western languages), I can understand why Mojang is keeping it simple and limited to just that. That is, there is a simple extended ASCII -only internal renderer, and then there is backing system's unicode font rendering.

The easier way through this might be to make a community effort to create a new unicode font (i.e. true type or such used by the OS/graphics engine) which looks like the ugly and limited default Minecraft font, but covers more glyphs, and then try to get that selectable into the game (feature request, but a small and easy one).

Any explanation why support for some of the languages include proper font while other have to use unicode one (without formatting and issues with visual compatibility) is marked as intended behavior?

Adding default font variants for every character would be a feature request.

Every character in this case means all characters that don't have a non-unicode font variant, so this is a feature request which belongs here.

Not every (even if its technically similar) but for languages which characters already present in-game. This is implemented and implemented poorly. I'm asking for fixing it.

No, you're basically asking to add default font variants of those characters, which is a feature request.

I take some of my earlier words back.. apparently the game now does contain lots of unicode bitmap font data in it, so one would assume it has the code to use them, too.

However, judging from the screenshots and description, this case in indeed an old one, and not a bug really. And it has been "fixed" by providing that "enforce unicode font" option.

That is, as a response to — "Any explanation why support for some of the languages include proper font while other have to use unicode one (without formatting and issues with visual compatibility)":
The unicode font is the proper font, for all languages. The default font is NOT a proper font (for anything else but some western languages, and looks bad anyway); if the developers had had some foresight, they would never had implemented that default font's extended ASCII crap in the first place. It was a dead idea 10 years before Minecraft's first line of code was written.

So I'd still say, that the proper solution is to enforce unicode rendering, adjust GUI scale to such that the text then looks readable, and if the style of the font isn't to one's liking, then get a mod for the unicode font bitmaps (supported stuff, afaik). I can live with the one that comes with the game.

What might be a sort of bug is the unicode font's scaling, which makes it look really bad at some GUI scales; any bitmap font looks good only at integer multiple size of the original, and unfortunately, Minecrafts scale steps have some in-between values. However, the scaling would in any case be a separate issue and probably already been reported (a number of times), for which the "fix" could be e.g. to force the GUI scales to such values that look good with the font in use. (For my case, I just select enforce unicode font, GUI scale "normal", and all looks good. Also, selecting scale "auto" and dragging the window for a suitable size can work, but that is not a good solution, really, as it is then restricting the window size.)

Another possible issue might be that unicode text does not get shadowed, like the default extended ascii text does. Again, separate issue. (And the default font's shadowing wasn't implemented very nicely, anyway.) Maybe there is some missing formatting functionality, too. (I haven't seen much such text in the game, so can't say.) That would also be a different issue, not a "doesn't have proper font".