Correct support for plural forms in Concrete5_Helper_Date->timeSince()
In English (and in many other languages) he have two forms for each words: singular (eg: day) and plural (eg: days).
Anyway some language have just one or more than two plural forms (for example Russian has 3 plural forms): see http://translate.sourceforge.net/wiki/l10n/pluralforms
The correct use of plural forms would be to use the recently added `t2()` function
Same as above for Concrete5_Job_IndexSearch->run()
Same as above for Concrete5_Job_RemoveOldPageVersions->run()
Same as above for the removal of pages with sub-pages
Same as above for /web/concrete/tools/dashboard/sitemap_empty_trash.php
Same as above for /web/concrete/tools/files/bulk_properties.php
Merge branch 'fix-plural-forms' of https://github.com/mlocati/concrete5 into mlocati-fix-plural-forms