D29878: Add support for multiple tags in XmlMessages.sh

[Andrius Štikonas]

stikonas created this revision.
stikonas added a reviewer: aacid.
stikonas requested review of this revision.

REVISION SUMMARY
  Tags are extracted from XML files and stored in msgctxt entry of pot file.
  
  This will invalidate existing translations but there aren't too many of them (only 20 very small files).

TEST PLAN
  Tested extraction with extract-xml script with two  tags (message, description).
  Created one po file corresponding to pot file.
  Injected translation back by running `python fillxmlfrompo.py ~/repositories/kde/kpmcore/src/util/org.kde.kpmcore.externalcommand.policy ~/repositories/kde/kpmcore/src/po kpmcore kpmcore._policy_.po`

REVISION DETAIL
  https://phabricator.kde.org/D29878

AFFECTED FILES
  extract-xml.sh
  fillxmlfrompo.py

To: stikonas, aacid
Cc: kde-i18n-doc
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