Comment 4 for bug 1824644

Reviewed: https://review.opendev.org/651547
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=6407c81be001b6ddeb788645f0a087b40ff67986
Submitter: Zuul
Branch: stable/queens

commit 6407c81be001b6ddeb788645f0a087b40ff67986
Author: francotseng <email address hidden>
Date: Wed Apr 3 14:17:37 2019 +0800

    Complete angular translation extract pattern

    Currently AngularGettextHTMLParser parses translations of form
    {$ 'content' | translate $}. However, there is another form in
    projects' html files: {$ ::'content' | translate $}.

    This commit fine-tunes the filter_regex and related handle_xxx
    functions to extract both forms of translations.

    Closes-Bug: #1824644
    Change-Id: I7129a13d046b699328b77267ae4936d31af8144c
    (cherry picked from commit 5de40b3f397f812d5236a274b22515b18118015c)