Fixed TabIndex on GitExtensionsSettingsPage and BuildServerIntegrationSe...

...ttingsPage and updated German translation

Updated German translation on master after fixing GitExtensionsSettingsPage to show correct TabIndex and 
BuildServerIntegrationSettingsPage small TabIndex change and made first label localizable with nice names

Change-Id: Iaaf929c76f4332641aa4a57a85e9259aac27da97