When I use phrases or create them I tend to use a real life inspiration and study the reasoning and roots of a language. I haven't used a lot, but I'm more inclined to a brief overview of the language paired with an abbreviated Lexicon.
I like how we've done something here showing the roots and development. I, for one, have been using approximated ancient Egyptian when trying to derive things based on the "ancient tongue". On rare occasions, though, I may have cheated and used Latin.
As far as individual races go, I'm a little possessive of the
theme/sound of the actual lexicon. If we started getting more specific I'd like to be able to keep the spirit of what I have begun.
For example, Symenos is influenced by Slavik languages, Shiber by ancient Hebrew, Tawna, Native American, Arumenic, modern Egyptian. I do my best to tailor the languages to how I conceive they would develop in the game. They're not mirrors, more sketches with a strong dose of fabrication.
Each inspiration was chose for similarity in geographical and cultural situation. Since we're not using an entirely made up language (due to the nature of writing in English and drawing from real languages for the ancient tongue) I think it's appropriate to adopt languages that really do intersect with rl counterparts.
Anyhoo, that's how I approach language making. My goal is to have a broad picture and a decent vocab with room for contribution, apart from that I get a bit bored.

For an example, note the very brief discussion I have under the Language section of the Eypharian writeup
here.