Linkify PO file occurences to source repository

[bugzilla-to-github]

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Bug 1501561

Bug Reporter: @mathjazz CC: @upwinxp

PO strings often come with a list of occurences in the source code.

Take a look at this string for example: https://pontoon.mozilla.org/sl/amo-frontend/LC_MESSAGES/amo.po/?string=192062

In the source string panel, you'll find an occurence presented as: #: src/amo/components/AddonTitle/index.js:39

It would be convenient if we could link the occurence to the repository: https://github.com/mozilla/addons-frontend/blob/master/src/amo/components/AddonTitle/index.js#L39

The url could be generated like this:

url = project.source_repository.website + '/blob/master/' + entity.source[i][0] + '#L' + entity.source[i][1];

Caveats:

• some projects use L10n-only repos
• /blob/master/ is probably a Github-specific path