Fix translations in Processing.py
[Processing] Inform listeners when all algorithms have been loaded.
[Processing] Fix advanced parameter handling in OTB algorithms.
[Processing] Add GDAL build virtual raster alg.
[Processing] Add GDAL build virtual raster alg - part 2.
Revert "Fix translations in Processing.py"

This reverts commit 81089a1fa258feb86a52db9bba1fd0708b5f70a7.
Merge pull request #1614 from radosuav/small_fixes

Small fixes for Processing