crowdin: Add option to submit all translation changes

* After a successful build, all changes have to be merged
* Instead of doing so manually or using own scripts, integrate such a
  functionality into the existing script
* Do the submit-check right at the beginning as we probably want to be
  able to submit on branches we haven't synced and we don't need all the
  files for this, anyway

Change-Id: I78b21608e2495f946be7cf6354d0136372b71187
diff --git a/README.mkdn b/README.mkdn
index ac6dbf6..6dc56e8 100644
--- a/README.mkdn
+++ b/README.mkdn
@@ -44,7 +44,7 @@
 
 Execute:
 
-    ./crowdin_sync.py --username your_gerrit_username --branch lineage_version [--upload-sources] [--upload-translations] [--download]
+    ./crowdin_sync.py --username your_gerrit_username --branch lineage_version [--upload-sources] [--upload-translations] [--download] [--submit]
 
 Bugs
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