feat: Add edx-proctoring to the translation pipeline

This PR needs openedx/edx-proctoring#1124 before it's merged.

Refs: FC-0012 OEP-58

.github/workflows/extract-translation-source-files.yml

@@ -42,6 +42,7 @@ jobs:
           - course-discovery
           - credentials
           - DoneXBlock
+          - edx-proctoring
           - RecommenderXBlock
           - xblock-drag-and-drop-v2
           - xblock-lti-consumer

transifex.yml

@@ -25,6 +25,14 @@ git:
     source_file_dir: translations/DoneXBlock/done/conf/locale/en/
     translation_files_expression: 'translations/DoneXBlock/done/conf/locale/<lang>/'
 
+  # edx-proctoring
+  - filter_type: dir
+    file_format: PO
+    source_file_extension: po
+    source_language: en
+    source_file_dir: translations/edx-proctoring/edx_proctoring/conf/locale/en/
+    translation_files_expression: 'translations/edx-proctoring/edx_proctoring/conf/locale/<lang>/'
+
   # frontend-app-account
   - filter_type: file
     file_format: KEYVALUEJSON