core: update messages.pot & l10n-fi.
locales/fi.po: update header.

[SKIP CI]
Alias: improve formatting of README.md.
Anonymous: add another example & add notice about...

...this plugin not meant for identifying even if it's possible and tell
how the identifying should happen.
AutoMode: update README.md.

[SKIP CI]
Merge pull request #729 from Mkaysi/core-l10n-fi

core: update messages.pot & l10n-fi.