Hotfix: 1.7.1

Issue tracker for 1.7.1

- [x] Add deactivation option for the Github updater class.
- [x] Fix an early API request that asks for themes before the user has entered their credentials.
- [x] doesn't appear on dashboard sidebar #36 & envato-wordpress-toolkit activated but doesn't appear in sidebar #29 
- [x] Switch to a font icon to be Admin Color Scheme compatible.
- [x] Add support for localization.
- [x] Clean up UI