move wrong testfiles elsewhere

games/devtest/mods/testtranslations/test_locale/readme.txt

@@ -0,0 +1,4 @@
+The translation files in this directory intentionally include errors (which
+would be reported when someone starts the devtest game in the de locale). This
+allows the unittest to check that the translation file reader also handles
+files that include errors.

src/unittest/test_translations.cpp

@@ -31,7 +31,7 @@ static std::string read_translation_file(const std::string &filename)
 {
 		auto gamespec = findSubgame("devtest");
 		REQUIRE(gamespec.isValid());
-		auto path = gamespec.gamemods_path + (DIR_DELIM "testtranslations" DIR_DELIM "locale" DIR_DELIM) + filename;
+		auto path = gamespec.gamemods_path + (DIR_DELIM "testtranslations" DIR_DELIM "test_locale" DIR_DELIM) + filename;
 		std::string content;
 		REQUIRE(fs::ReadFile(path, content));
 		return content;