Add sanity check for syntax errors in translations (#1978)

The pull request should be blocked on basic typos breaking the SMC file.

tools/language_check/sanity_check.py

@@ -0,0 +1,42 @@
+#!/usr/bin/python3
+# Copyright (c) 2023 Peace-Maker
+import pathlib
+from smc_parser import smc_string_to_dict
+
+# Parse the languages.cfg file to know which languages could be available
+had_problem = False
+file_count = 0
+languages_cfg = smc_string_to_dict(
+    pathlib.Path('../../configs/languages.cfg').read_text('utf-8'))
+print(f'Checking {len(languages_cfg["Languages"][0])} languages...')
+
+# Try to parse all the files as a simple smoke test for syntax errors
+for langid, lang in languages_cfg['Languages'][0].items():
+    if langid == 'en':
+        path = '../../translations'
+    else:
+        path = f'../../translations/{langid}'
+
+    for file in pathlib.Path(path).glob('*.txt'):
+        if not file.is_file():
+            continue
+
+        file_count += 1
+        try:
+            phrases = smc_string_to_dict(file.read_text('utf-8'))
+            if 'Phrases' not in phrases:
+                print(
+                    f'Error in {langid}/{file.name}: File does not start with a "Phrases" section'
+                )
+                had_problem = True
+                continue
+        except Exception as ex:
+            print(f'Error in {langid}/{file.name}: Error parsing: {ex}')
+            had_problem = True
+            continue
+
+print(f'Checked {file_count} files.')
+
+if had_problem:
+    print('Sanity check failed!')
+    exit(1)