I know it's been mentioned in n800 section but since it's very n810 specific I thing it's worth reminding.
I've just found it - installed on Diablo using install file from the page below - works perfectly (ukeyboard).

http://upir.cz/maemo/keyboards/

HW section is the most interesting for us.

Quote:
On-screen keyboard:
Arabic (Lebanon)
Bulgarian (BDS and phonetic)
Croatian (QWERTZ and QWERTY)
Czech (QWERTZ and QWERTY)
Hungarian (QWERTZ)
English (Dvorak)
Esperanto (QWERTY)
Slovak (QWERTZ and QWERTY)
Thai (Kedmanee)


Sliding keyboard:
Bulgarian (phonetic)
Czech (QWERTZ and QWERTY)
Slovak (QWERTZ and QWERTY)
Polish