[V3] add a script for regenerating all strings (#1318)

* [V3] add a script for regenerating all strings

* Edits to the yml files

* Fix up deploy section

* Make generate_strings upload to Crowdin

redbot/cogs/streams/locales/regen_messages.py

@@ -0,0 +1,15 @@
+import subprocess
+
+TO_TRANSLATE = [
+    '../mod.py'
+]
+
+
+def regen_messages():
+    subprocess.run(
+        ['pygettext', '-n'] + TO_TRANSLATE
+    )
+
+
+if __name__ == "__main__":
+    regen_messages()