Live Chat Unlimited 3.7.6

- Fixed undefined HTTP_USER_AGENT error
- Fixed conflict with other JWT libraries
- Fixed WPML translating for response times

+ Added 'default' option to "Always show up on homepage/blog-related pages" to prevent conflicts with "Hide on mobile devices" display option
* Downgrade to Firebase 4.13.0 (from 5.2.0) to be compatible with all WP installations
! Fixed saving chat options issue for other user roles like Editor, Author, etc...

+ Added "collector card"
+ Added "solved" and "not solved" feedback in chat console
+ Added "show up for logged in WP users only" option
+ Added "Arabian" translation (thanks to General Satam)
* Firebase is updated into 5.2.0 (from 4.8.2)
* Removed Christmas background theme
! Fixed appearance issue on vote buttons in chat widget
! Fixed issue on non-latin characters in chat console like Hebrew, Chinese...
! Fixed flash.svg 404 PHP warning
! Fixed missing operator name appearing on other chat notifications where other operators handle in chat console