Experimenting on the look of the lessons screen.
Removed unused CSS.
Code clean-up, reader bug-fixes, compiled RTL CSS.
Refactored CSS, added LTR/RTL Sass compilation task to Gruntfile.
Removed unused CSS files.
Filtering on API endpoints, bugfix for lesson screen.
Updated App categories. Run "fab import_db" to pull in the updates.
Grammar API endpoint includes titles in other languages.
Lesson screen and textbook content localization support.
Merge pull request #48 from OpenPhilology/lessons-screen

Lesson content localization.