Check for wrong whitespaces in project name

This adds checks to check for missing non-breaking space in "0 A.D.".

source/tools/i18n/check_translations.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 #
-# Copyright (C) 2024 Wildfire Games.
+# Copyright (C) 2025 Wildfire Games.
 # This file is part of 0 A.D.
 #
 # 0 A.D. is free software: you can redistribute it and/or modify
@@ -18,6 +18,8 @@
 
 """Lint PO- and POT-files."""
 
+# ruff: noqa: RUF001
+
 import logging
 import re
 import sys
@@ -150,6 +152,69 @@ class InvalidTagRule(LintRule):
         return msgs
 
 
+class WrongWhitespaceIn0AD(LintRule):
+    num = "E904"
+    name = "wrong-whitespace-in-translatable-string"
+    desc = "msgid contains 0 A.D. without non-breaking space"
+
+    def __init__(self):
+        super().__init__()
+        self.zeroad_regex = re.compile(r"0[^ ]?A[\s \.]{1,2}D[\s \.]{1,2}", flags=re.IGNORECASE)
+
+    def lint(self, _: VariableTokenizer, linted_entry: LintedEntry) -> list[LintMessage]:
+        msgs = []
+
+        for trstr in linted_entry.strs:
+            wrong_whitespaces = []
+            for msgid in trstr.msgid_strings:
+                if self.zeroad_regex.search(msgid):
+                    wrong_whitespaces.append(msgid)
+
+            if wrong_whitespaces:
+                msgs.append(
+                    LintMessage(
+                        ERROR,
+                        linted_entry.poentry.linenum,
+                        0,
+                        self.num,
+                        f"string contains 0 A.D. without non-breaking space: "
+                        f"{trstr.msgstr_string}",
+                        linted_entry.poentry,
+                    )
+                )
+
+        return msgs
+
+
+class WrongWhitespaceIn0ADInTranslation(LintRule):
+    num = "E905"
+    name = "wrong-whitespace-in-translation"
+    desc = "msgstr contains 0 A.D. without non-breaking space"
+
+    def __init__(self):
+        super().__init__()
+        self.zeroad_regex = re.compile(r"0[^ ]?A[\s \.]{1,2}D[\s \.]{1,2}", flags=re.IGNORECASE)
+
+    def lint(self, _: VariableTokenizer, linted_entry: LintedEntry) -> list[LintMessage]:
+        msgs = []
+
+        for trstr in linted_entry.strs:
+            if self.zeroad_regex.search(trstr.msgstr_string):
+                msgs.append(
+                    LintMessage(
+                        ERROR,
+                        linted_entry.poentry.linenum,
+                        0,
+                        self.num,
+                        f"translation contains 0 A.D. without non-breaking space: "
+                        f"{trstr.msgstr_string}",
+                        linted_entry.poentry,
+                    )
+                )
+
+        return msgs
+
+
 def get_relative_path(path: Path) -> Path:
     """Get relative path to project directory.