Assuming you mean texting style acronyms, yeah, we have them in German and I’d assume in other languages too.
Alongside the stuff borrowed from English 1:1, there’s stuff like bb for “Bis bald” (See you soon) or hdl for “hab dich lieb” (Love you)
I’d assume other languages do the same out of efficiency or laziness.
I’m not sure if you’re joking or not, but the behavior of journald is fairly dynamic and can be configured to an obnoxious degree, including compression and sealing.
By default, the size limit is 4GB: