Merge pull request #183 from piwik/translationupdates

[automatic translation update] Updated 296 strings in 7 languages (bg, de, es, et, fa, he, it)
adding estonian translations for devicesdetection plugin. thx @tehnotronic
Fix typo
Fix notice reported in http://forum.piwik.org/read.php?2,109114
Fix integration tests after minor language updates
added et translations
Fixing build after language changes
Fixes #4453 During installation, the theme is not yet ready to be used.
thanks for the report!
include plugins translations in calculation of language infos
use php instead of shell commands, to be more system independent