The Jungle village she lives in also seems to be outside of Japan, since they called some Japanese dude Guu swallowed into one of her "stomachs" foreign.
The term "Prime Minister" is only used by foreign media, and occasionally foreign leaders, as the word "Taoiseach" would simply fall on confused ears when spoken outside of Ireland.
In the case of anime or other shows being aired outside their home country, these changed credits may or may not carry over into foreign broadcasts, with overseas airings using only the first version of the credits or different ones entirely instead.