Use absolute imports on all plugins

This is necessary because Gajim is with 0.16.11 a python package

plugins_translations/manifest.ini

@@ -1,8 +1,8 @@
 [info]
 name: Plugins translations
 short_name: plugins_translations
-version: 0.6.5
+version: 0.6.6
 description: This plugin contains translation files for Gajim plugins
 authors = Denis Fomin <fominde@gmail.com>
 homepage = http://trac-plugins.gajim.org/wiki/PluginsTranslationsPlugin
-min_gajim_version: 0.16.10
+min_gajim_version: 0.16.11

plugins_translations/plugins_translations.py

@@ -3,10 +3,10 @@
 
 import os
 
-from common import gajim
-from plugins import GajimPlugin
-from plugins.helpers import log_calls
-from plugins.plugins_i18n import _
+from gajim.common import app
+from gajim.plugins import GajimPlugin
+from gajim.plugins.helpers import log_calls
+from gajim.plugins.plugins_i18n import _
 
 
 class PluginsTranslationsPlugin(GajimPlugin):
@@ -17,7 +17,7 @@ class PluginsTranslationsPlugin(GajimPlugin):
             'for Gajim plugins')
         self.config_dialog = None
         self.config_default_values = {'last_version': '0'}
-        self.locale_dir = os.path.join(gajim.PLUGINS_DIRS[1], 'locale')
+        self.locale_dir = os.path.join(app.PLUGINS_DIRS[1], 'locale')
 
     @log_calls('PluginsTranslationsPlugin')
     def activate(self):