Merge branch 'maint-2.0' into maint-2.1

* maint-2.0:
  installation: fix alembic dependency version
  I18N: German translation updates
  i18n: message catalogue update and clean-up
  I18N: updates to Spanish translation
  I18N: complete Italian translation for v1.2
  I18N: complete Italian translation
  I18N: complete French translation
  OAIHarvest: resumptionToken fix

Author: jirikuncar

THANKS

@@ -90,6 +90,12 @@ Several people contributed language translations:
   - Mehdi Zahedi <[email protected]>
     Contributions to the Persian (Farsi) translation.
 
+  - Guillaume Dorsival <[email protected]>
+    Contributions to the French translation.
+
+  - Charlotte Iris Cattaneo <[email protected]>
+    Contributions to the German, Italian, and Spanish translations.
+
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