Merge pull request #1532 from Martynas-P/master

Fixed Captchas
more api work done
more api work done
Changed hard-coded language string. Closes #1538
Merge branch 'master' of https://github.com/opencart/opencart
https://github.com/opencart/opencart/issues/1547
Merge branch 'master' of https://github.com/opencart/opencart
more api work done
https://github.com/opencart/opencart/issues/1546
https://github.com/opencart/opencart/issues/1544
https://github.com/opencart/opencart/issues/1542
more api work done
https://github.com/opencart/opencart/issues/1543
reverted the serialize back as testing code using json was left over
https://github.com/opencart/opencart/issues/1548
https://github.com/opencart/opencart/issues/1549
more api work done
Update header.tpl

+ titles to header icons
- last empty line
Update english.php

1 ``tab_profile`` too much
https://github.com/opencart/opencart/issues/1571