[GUI] Re-adding upload and empty state icons and highlighting the buttons for language and channel selection.
Merge branch 'develop' of github.com:XIMDEX/ximdex into develop

* 'develop' of github.com:XIMDEX/ximdex:
  Changing ajax request to jquery method
  Update install.inc
  Minor changes on translations and adding a new command on the actions flow.
  Template fixed when there aren't any files to download.