Hymn Lyrics Search - Name That Hymn

I was having a Welsh moment, having lived in y Lloegr for many years. We sang this in our Primary School in Cardiff in the 1970's! I've never been fluent in Welsh, but the lyrics sound very familiar and cringe worthy now. I'm sure it was translated in our school as 'Over in China, and next to Japan, little children like us live...' Either they couldn't speak Welsh, had changed the lyrics, or were hiding an outrageous racist agenda! And Mrs Davies seemed so nice...

This "hymn" is a typical British colonial mentality! It's disgusting! Why the Welsh people wanted to be part of such an evil "empire" is beyond me.
And as for "missionaries" going to other countries to force their god down the necks of other cultures.....GWARTHUS