Bug fixes and some improvements to Finnish localization (#3306)

* Update messages.po

Couple of nasty bugs.

* Update messages.po

Bugs and improvements

* Update messages.po

Hashtag = aihetunniste, not just "tunniste"

* Update messages.po

typo

* Update messages.po

Liked by, tykännyt

* Update messages.po

More translations.

* Update messages.po

* Update messages.po

* Update messages.po

Following - Seurataan

* Update messages.po

one typo

* Update messages.po

line 352 fixed