fix bug 21598. r=cata a=chofmann change the internal charset name from X-EUC-TW to x-euc-tw

intl/uconv/src/nsCharsetConverterManager.cpp

@@ -307,7 +307,7 @@ nsresult nsCharsetConverterManager::RegisterConverterPresenceData(
   if (NS_FAILED(res)) goto done;
   res = registry -> SetInt(key, "x-fake-2000", 1);
   if (NS_FAILED(res)) goto done;
-  res = registry -> SetInt(key, "X-EUC-TW", 1);
+  res = registry -> SetInt(key, "x-euc-tw", 1);
   if (NS_FAILED(res)) goto done;
 
 done:

intl/uconv/ucvtw2/nsUCvTw2Module.cpp

@@ -127,14 +127,14 @@ static FactoryData g_FactoryData[] =
   {
     &kEUCTWToUnicodeCID,
     nsEUCTWToUnicode::CreateInstance,
-    "X-EUC-TW",
+    "x-euc-tw",
     "Unicode"
   },
   {
     &kUnicodeToEUCTWCID,
     nsUnicodeToEUCTW::CreateInstance,
     "Unicode",
-    "X-EUC-TW"
+    "x-euc-tw"
   },
   {
     &kUnicodeToCNS11643p1CID,