If you want chinese traditional Hong Kong language, you must search for zh.lng and zh.T9, upload them with "A2Uploader" in : TPA/preset/system/language, delete lng.lst and lng.dat, then upload this edited
"customize.xml" to TPA/preset/custom(delete "customize.xml"from your phone and replace it with the edited one) . Since TM506 is DB3150, it should work.