Simple question... How much have you played around with designing languages?
Sounds like I'm about as much as anyone else. Words and phrases...getting the "sounds" of a particular language down. The most I've worked on any has been my world's elf language (followed closely by a dwarven tongue and runic alphabet)...For the elves, I've gotten as far as some grammar and syntax, pre- and suffixes, that sorta thing.
Also have done some work on a language of arcane magic and the tongue used to cast "divine" magic...an ancient/no longer spoken language of a fallen empire...akin to real world Latin, that is the language of spellcasting/"invoking" for the priests/clerics.
For the most part, I come up with a phrase/spell and then just save it to a "language index" file I keep so that when I'm writing my "Tales of Orea" Story Hour fiction, I am consistent.
I'm no J.R.R. Tolkien, by any stretch! hahaha. But have always found linguistics fascinating and do like to incorporate a modicum of validity/consistency to the languages of my world to really give/get an "immersion" feel in play. I've never had any complaints...yet
EDIT: I've also devised a system of "naming conventions" for surnames among the human population....various prefixes that of descended from various language branches to give the characters from different nations an added sense of "nationality" to their characters...and a general "sound" to their first names.
For example, humans from the southern kingdom generally ALL have a surname of "Kar [whatever]". This means "son of" as in, literally, "the son of [their father]" or father's father or might be "son of [wherever they're from], a.k.a. "native son of [this particular countryside/thane's land]"
Example 2: the prefix of "D' " used in the northern human lands...is borrowed from the elvin prefix to denote a river...literally, "flowing from". In elvin, the river "D'Alevia"= "Flowing from or the River of Life." But in the northern kingdom of Grinlia (where elves are all but gone), the man named "Stelak D'Ensior" directly translates as "Stelak flowing from (the blood or location of) Ensior."
--Steel Dragons.