'Never say' would translate to: 決して言わないでください /kesshi* te i WA nai de ku da sai/ in polite Japanese. [*: the 'shi' syllable is pronounced geminated. When read together the 'i'...
日本の旗 (にほんのはた) nihon/nippon no hata - Literally "Japan's flag" or "the flag of Japan". You could also simply replace "hata" with flag ("furagu" when pronounced the Japanese...