Merge branch 'hotfix/better_message' into develop

Added green/red colors on success or error when inserting emails and now server answers email insertion as JSON
Merge branch 'hotfix/better_landing' into develop
Merge branch 'hotfix/locale' into develop
Merge branch 'hotfix/question' into develop
Merge branch 'hotfix/better_ui' into develop
Merge branch 'master' into develop
change buttons text
Merge branch 'develop'