[plugins_translation] add de, nl and fr translations. Fixes #259

plugins_translations/manifest.ini

 [info]
 name: Plugins translations
 short_name: plugins_translations
-version: 0.6.6
+version: 0.7
 description: This plugin contains translation files for Gajim plugins
 authors = Denis Fomin <fominde@gmail.com>
-homepage = http://trac-plugins.gajim.org/wiki/PluginsTranslationsPlugin
+homepage = https://dev.gajim.org/gajim/gajim-plugins/wikis/PluginsTranslationsPlugin
 min_gajim_version: 0.16.11