Force Latin alphabet for Montenegro (#4849)

This fix forces Latin alphabet for Montenegro (Montenegro only use Latin
character set).
Without this fix the Montenegro Serbian, for example, displaying Serbian
Cyrillic.

Can't do this in the lower code inside uloc_getCountry() because
uloc_getCountry is a thirdparty library code.

b/370816783

Author: yuriy-chumak

cobalt/base/language.cc

@@ -37,6 +37,11 @@ std::string GetSystemLanguage() {
   std::string language = buffer;
   uloc_getCountry(NULL, buffer, arraysize(buffer), &icu_result);
   if (U_SUCCESS(icu_result) && buffer[0]) {
+    // Montenegro uses the Latin alphabet.
+    // Needs to be forced, as not all platforms know it.
+    assert (sizeof(buffer) > 7); // sizeof("Latn-ME")
+    if (strcmp(buffer, "ME") == 0)
+      strncpy(buffer, "Latn-ME", sizeof(buffer));
     language += "-";
     language += buffer;
   }