Travis: Initiating build for commit 'c51c81f9a5e5e48fa97178c77b75fcfe4e13f7b5' on branch 'master': Merge pull request #6391 from piwik/translationupdates

[automatic translation update] Updated 278 strings in 10 languages (pt, cs, da, de, el, es, et, it, pl, ja)