Translation comment parsing could be improved

[Kip Warner]

The Launchpad translation user interface could make life a bit easier for translators with two small improvements. The first would be to allow comments in the message catalog that precede each message string which are more than one line to be displayed in their entirety. Right now, the developer has the choice of showing at most either the source string file and line number, or a comment for context - but not both since only one line can be displayed in the current user interface and xgettext puts these two types of comments on separate lines. Moreover, some context comments may be more than one line.

The second improvement would be to make the source location displayed in the user interface as an actual URL so, if a translator wishes, they could click it and it would navigate their browser in a separate window to the source file and line number. As an example, clicking the following in the translation user interface would take the translator to the given location if stored in a LP branch.

 Located in ../../Source/LauncherApp.py:260