[GUI] Fixing some issues with webfonts in FF, and aplying some others general styles.
Merging origin develop
Merge branch 'develop' of https://github.com/XIMDEX/ximdex into develop

* 'develop' of https://github.com/XIMDEX/ximdex:
  Translating welcome action into spanish
  Updates gitignore with new installation files
  Moves js animation code to a dedicated file
Merge branch 'develop' of https://github.com/XIMDEX/ximdex into develop

* 'develop' of https://github.com/XIMDEX/ximdex:
  added install directory permissions