Sincerement is sincerely in French
Fish is "kala".
to end a perfect letter you could write sincerely, sincerely yours, very sincerely, or very sincerely yours
"Turpa kiinni"
诚挚Chéngzhì
At the end of the letter write yours sincerely.
You could write either, Yours Sincerely (if you know them) or Yours Faithfully (if you don't know them).
dear hotel adress: what are your rates sincerely......
You'd need a keyboard with umlauts, or you have to use unicode characters.
"[ole] hiljaa!" ("[be] quiet"), or if provocatively "turpa kiinni" ("shut your mouth")
The Finnish language is suomi (Finnish) or suomen kieli (Finnish language) in Finnish.
Sincerely yours