Fixes Google Drive

Improved user guidance for Google Drive
Improved Errorhandling for Google Drive
Update french translation
Added ukranian translation
Improvements on updater: calibre-web.log1, calibre-web.log2, gdrive_credentials, settings.yaml, gdrive.db, .git are no longer deleted upon update

cps/gdriveutils.py

@@ -20,7 +20,7 @@
 try:
     from pydrive.auth import GoogleAuth
     from pydrive.drive import GoogleDrive
-    from pydrive.auth import RefreshError
+    from pydrive.auth import RefreshError, InvalidConfigError
     from apiclient import errors
     gdrive_support = True
 except ImportError:
@@ -166,7 +166,10 @@ def getDrive(drive=None, gauth=None):
         # Save the current credentials to a file
         return GoogleDrive(gauth)
     if drive.auth.access_token_expired:
-        drive.auth.Refresh()
+        try:
+            drive.auth.Refresh()
+        except RefreshError as e:
+            web.app.logger.error("Google Drive error: " + e.message)
     return drive
 
 def listRootFolders():
@@ -454,6 +457,10 @@ def getChangeById (drive, change_id):
     except (errors.HttpError) as error:
         web.app.logger.info(error.message)
         return None
+    except Exception as e:
+        web.app.logger.info(e)
+        return None
+
 
 # Deletes the local hashes database to force search for new folder names
 def deleteDatabaseOnChange():