Refs #415 - incorrectly typed usernames not highlighted

It works for twitter, because tweets contain a list with referenced
(and thus recognised) users. This information is not available for
identi.ca, so there misspelled user names are still highlighted.
FIX english locales mistake WARNNING -> WARNING
add selected text to Kismet filters
Merge pull request #424 from Simounet/fix

FIX english locales mistake WARNNING -> WARNING
Merge pull request #425 from Simounet/kismet

add selected text to Kismet filters
FIX inverted translations for Adding to Kismet filters
Merge pull request #427 from Simounet/kismet

FIX inverted translations for Adding to Kismet filters
add cmake for mingw compile
fix mingw builds
Corrected some minor typoes.
Feature done
Merge pull request #434 from Azenet/isnsfw

No preview upon NSFW
mingw build fix
polish mingw
Merge pull request #442 from marguerite/master

add mingw support(experimental)
Galician translation
Corrección de cabeceira
Merge pull request #446 from meixome/master

Galician translation
Closes #445 - preferences window now showing for statusnet accounts

This is probably more a workaround than a real fix.

For statusnet accounts, the preferences window crashed because
prefs.filter_nsfw_media was undefined. I don't know why.
I now just skip the code that uses this property when the
property is not defined.
Update data/_locales/es/messages.json