Various fix and enhancement

[BuonOmo]

Sorry I should have made a PR according to each improvement, but I kind of did it without thinking! Here are the changes:

• translation in english for the github and bickbucket part (commit 3386b76)
• Fix url for view on github, it was name/name/repo, i removed one name (commit 2f9edc0)
• Add a "take" command for github, a shorthand for update --assignee=<me> (commit 7485de1)
• Add the commit command for github (commit 4a814cd)
• correct orthograph (commit 59642dd)

I had an issue regarding your specs, I couldn’t make them work. If you tell me how it works I can add specs for the functionalities I made.