i18n: Add script to process mobile locales.

This script iterates over all the mobile.json resources and creates a
single file at static/locale/mobile_info.json which contains total and
not-translated strings information against each language. After doing
this, it deletes all the mobile i18n resources downloaded by
tools/sync-translations because we neither want to check them in our
repository nor we want to make our repository dirty.

scripts/process-mobile-i18n

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+import json
+import os
+import re
+from subprocess import check_output
+from typing import Dict, List
+
+def get_json_filename(locale: str) -> str:
+    return "static/locale/{}/mobile.json".format(locale)
+
+def get_locales() -> List[str]:
+    tracked_files = check_output(['git', 'ls-files', 'static/locale'])
+    tracked_files = tracked_files.decode().split()
+    regex = re.compile('static/locale/(\w+)/LC_MESSAGES/django.po')
+    locales = ['en']
+    for tracked_file in tracked_files:
+        matched = regex.search(tracked_file)
+        if matched:
+            locales.append(matched.group(1))
+
+    return locales
+
+def get_translation_info(resource_path: str) -> Dict[str, int]:
+    with open(resource_path) as raw_resource_file:
+        raw_info = json.load(raw_resource_file)
+
+    total = len(raw_info)
+    not_translated = len([i for i in raw_info.items() if i[1] == ''])
+    return {'total': total, 'not_translated': not_translated}
+
+translation_info = {}  # type: Dict[str, Dict[str, int]]
+locale_paths = []  # List[str]
+for locale in get_locales():
+    path = get_json_filename(locale)
+    if os.path.exists(path):
+        info = get_translation_info(path)
+        translation_info.update({locale: info})
+        locale_paths.append(path)
+
+resource_file_path = os.path.join('static', 'locale', 'mobile_info.json')
+with open(resource_file_path, 'w') as f:
+    json.dump(translation_info, f, indent=2, sort_keys=True)
+    f.write('\n')
+
+print("Mobile resource file created at: " + resource_file_path)