Merge pull request #450 from wallabag/dev

1.5.0
Merge pull request #468 from wallabag/dev

1.5.1
Merge pull request #469 from wallabag/dev

version number 1.5.1
Merge pull request #481 from wallabag/dev

1.5.2
acc
Merge remote-tracking branches 'upstream/dev' and 'origin/master' into dev
Update brazilian translation
Correct README.md
Merge pull request #563 from camporez/dev

Update brazilian translation