I wouldn't say "supported". Language
support generally includes:
- display/rendering
- input
- keyboard layouts
- fonts
Only few years before even PCs supported all of these and it will take more
years to get this in all gadgets. So, the only expectation now is to at
least display the characters well. Input is the next priority which can be
solved by 3rd party apps for time being once the display issue is solved.
- spellcheckers
- dictionaries
We don't have reliable and exhaustive solutions for these yet even in PC.
Only some online dictionaries and alpha level spell checkers for browsers
are available in FOSS.
Ravi