Make more strings translatable

Signed-off-by: Paul de Wouters <paul@hmn.md>
Add context info for translators
Limit number of comments by user widget setting
update translation files
adds an experts widget
display gravatar
clean up
Merge pull request #58 from humanmade/issue-58

Update French translations
Merge pull request #73 from humanmade/issue-73

Expert users widget
Merge branch 'master' into issue-52

Conflicts:
	inc/widgets/class-widget-most-voted.php