fix grammar

Currently translated at 100.0% (960 of 960)

As we no longer limit which test runs run Selenium, the related code can
be removed.

- test real login
- open profile page
- do logout afterwards

- do not try to test in browsers which are currently broken on Sauce
- verify login form behavior
- always create all test classes, this makes code easier to understand

Currently translated at 57.6% (553 of 960)

Otherwise new source string ones get's into play...

Use httretty for mocking up machine translation tests

This way we don't rely on running services and also do not push too much
on them during heavy development.

Currently translated at 99.2% (953 of 960)

Currently translated at 34.6% (333 of 960)

Currently translated at 100.0% (960 of 960)

Currently translated at 100.0% (960 of 960)

Currently translated at 100.0% (960 of 960)

Currently translated at 100.0% (960 of 960)