Merge pull request #5 from mfoxtrot/Lesson_4

Lesson 4
Lesson 4: Fix route for check_translation
Lesson 4: Updated
Lesson 4. Fix routes for check_translation, set Card.all instead of Card.all.limit...
Merge pull request #8 from mfoxtrot/Lesson_4_updated

Lesson 4 updated
Lesson 5: Fix some git conflicts