Short Version:
the lang file for forge does not contain an option to change what the "Mods" button on the title screen says.
Unabridged:
I'm making a homestuck (a webcomic by andrew hussie, found here: http://www.mspaintadventures.com/) modpack, using forge version 9.11.1.965 for minecraft 1.6.4., and i made all the other words on the title screen green by putting "§2" before the words "Multiplayer" and "Singleplayer" in the en_US lang file in a resource pack. I would also like to make the word "Mods" on the button on the title screen green. the lang file found in (it's on the technic launcher) modpack.zip/assets/forge/lang does not contain an option to change this. I'm not sure how to embed a picture; here's a link to it: http://fc06.deviantart.net/fs71/i/2014/218/3/a/the_problem_by_taksta90-d7tz869.png