update all translations with 30% or more complete

Merge branch 'master' of https://github.com/Sigil-Ebook/Sigil

More Mac OSX build doc changes for El Captitan

Update to latest translations

Update launcher version and update testplugin to work with newest Sigil

Update build version to 0.9.3

Update translations for release

Remove need to fix self closing tags by improving gumbo

Cleanup some meaningless compiler warnings

Add in translations - remove inactive translations