Re Der Emes –
The newspaper cannot be used as any proof of spelling in Yiddish. The newspaper was a Soviet paper, not a Jewish paper, and the word Emes is a word in Loshon HaKodesh, so no need to change the spelling for Yiddish. The fact that the Soviets did not connect Yiddish to the Torah, they needed to spell the word phonetically. But the real way to spell that would be exactly as philosopher said דער אמת.