Merge pull request #770 from craigcook/master

 Bug 797192 - some CSS fixes for plugincheck page
Bug 861163 - gettext errors at extraction caused by empty gettext calls
Merge pull request #772 from pascalchevrel/bug-861163_fix_gettext_extraction_error_messages

Bug 861163 - gettext errors at extraction caused by empty gettext calls
Bug 860991 - Firefox persona preview broke
Merge pull request #773 from chrismore/patch-5

Bug 860991 - Firefox persona preview broke
Bug 860991 - Firefox persona preview broke
Merge pull request #774 from chrismore/patch-6

Bug 860991 - Firefox persona preview broke
Bug 860991 - Firefox persona preview broke
Merge pull request #775 from chrismore/patch-7

Bug 860991 - Firefox persona preview broke
[Fix Bug 860946] Fix incorrect order of arguments on download urls in /firefox/all/
Merge pull request #777 from Sancus/master

[Fix Bug 860946] Fix incorrect order of arguments on download urls in /firefox/all/
improved semantics on the plugincheck page