Create 2to3_language_code.sh

This is a example to see if we can make it possible to change the language code from 2 to 3 iso code.
add this to your postprocessing line.

Bazarr/2to3_language_code.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+mv "{{subtitles}}" "{{directory}}/{{episode_name}}.{{subtitles_language_code3}}.srt"
+
+exit