Unfriendly strings for translators
We need to avoid as much as we can to include html tags and placeholders on the @self.tr(@ calls. Those strings are passed directly to the translators and can confuse or even maybe to break the UI looks if the translator does something wrong.
e.g.: https://github.com/leapcode/bitmask_client/blob/develop/src/leap/bitmask/gui/mainwindow.py#L1020
(from redmine: created on 2015-12-15)