upgrade test for micter59
(http://www.glpi-project.org/forum/viewtopic.php?pid=169348#p169348)
Localization fix, fixes Issue #22
Corrected column names in query in plugin_customfields_upgradeto116().

Should fix #23
#25 : Fix spanish locale
Merged entity-based filter/restriction #24. This fixes a regression due
to the fork from the original code.

Update localization strings for french, and english. German translation
needed.
Create new localization string for German, and Italian languages.
Fix localization strings
Fix #26 : wrong variable used. Actually the fix is on some useless code.
German localization for #27
Fixing line endings
Merge branch '1.5-bugfixes' into 1.6