fix(event-tracking): stripe sub, not pp
fix(pets): add questPets to UserSchema.items.mounts too fixes #2814
feat(marketing): start fleshing out the about page with images, content,
etc. Create separate videos page
feat(marketing): more copy for mobile
Merge pull request #2813 from benmanley/develop

Fix alignment of task meta icons (glyphicons)
fix(css): menu and gems wallet margin
fix(misc): isStaticPage and debug buttons
chore(i18n): prepare english for transifex: remove ending or starting space & _comment strings
fix(misc)
feat(event-tracking): pass ga to server user.ops
feat(event-tracking): track registration count
feat(event-tracking): better page-view tracking via ui-router
fix(event-tracking): typo
fix(i18n): do not save user language for now
Merge branch 'develop' of https://github.com/HabitRPG/habitrpg into develop