update general_tools.po   ja translation
further translation of po-files and corrected little mistake in qgis_configuration.rst
Merge pull request #15 from junek/manual_en_v1.8

further translation of po-files and corrected little mistake in qgis_con...
Merge pull request #77 from dassau/manual_en_v1.8

Manual en v1.8
started translating Options tabs
Merge pull request #16 from junek/manual_en_v1.8

started translating Options tabs
Merge pull request #78 from dassau/manual_en_v1.8

Manual en v1.8
update general_tools.po  translatio ja
Merge branch 'manual_en_v1.8' of https://github.com/qgis/QGIS-Documentation into manual_en_v1.8