D5648: Support translation catalogs added in KDE Application release tarball

[Friedrich W. H. Kossebau]

kossebau created this revision.

REVISION SUMMARY
  Starting with KDE Applications 17.04 the po files for the translations
  are now added to the tarball of the sources they belong to, instead of
  being released separately.
  The release script also makes the assumption that all KDE Applications
  use CMake, ECM and KI18n and simply inject the lines
  ecm_install_po_files_as_qm(poqm)
  ki18n_install(po)
  to the end of the toplevel CMakeLists.txt.
  
  Which does not work for Marble. To solve this, the release script
  creating the KDE Applications tarballs gives Marble some special handling.
  
  Additionally Marble's buildsystem needs to handle the case of Qt-only
  building, where both macros are not available.
  
  This patch solves this for now  by using a custom macro for the po->qm files,
  and (in a temporary hacky way) calling ki18n_install in a subdir
  where the macro is known due to linking against KI18n and which will be
  skipt in qt-only builds.
  
  For that this patch moves the existing code for handling the
  po->qm translations for the bundle packaging of marble-maps into the
  global MarbleMacros.cmake file and adapts it, so it can be reused also 
  for the release tarball po->qm files.

TEST PLAN
  Without po and poqm file build works as before.
  Copied the po and poqm files from the released tarballs into the
  toplevel dir, qm & mo files were created and installed as they should.
  
  Custom bundle_translations target also works as before.

REPOSITORY
  R34 Marble

BRANCH
  supportKDEAppsTarballTranslations

REVISION DETAIL
  https://phabricator.kde.org/D5648

AFFECTED FILES
  CMakeLists.txt
  MarbleMacros.cmake
  data/lang/CMakeLists.txt
  src/apps/marble-kde/CMakeLists.txt

To: kossebau, rahn, nienhueser, ltoscano
Cc: marble-devel
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