Activated and built Japanese language.
Merge branch 'spreed-speakfreely-japanese' of https://github.com/cfrisemo/spreed-speakfreely into spreed-speakfreely-japanese
Update of Japanese language file.
Merge branch 'spreed-speakfreely-japanese' of github.com:cfrisemo/spreed-speakfreely into cfrisemo-spreed-speakfreely-japanese

Conflicts:
	src/i18n/messages-ja.po
Updated and rebuilt Japanese (ja) translation.
Fixed text shadow in overlayAction buttons.
Updated dynamic styles to work with new renderer styles.
Onlye hangup call when really onloading and not before.
Brought back pointer events in remote videos on kiosk view.
Improved visibility of overlay actions.
Make sure that there is enough room for videos in kiosk mode and scroll if there isnt.
Prepare for 0.17.4 release.