Merge pull request #1363 from Cracert/i18n

[TRANSUP] pl: composer
move internal python extensions to common directory and fix metasearch install
processing: remove adsense from otb descriptions
german translation update
exclude metasearch ts files from update_ts_files.sh run
debian packaging update
osgeo4w: don't include internal python libraries where packages are available
spelling fixes
metasearch: ignore proxy settings != HttpProxy
[TRANSUP] pl: qgisapp