C2 hasn't "ressource plugin", wrong section Somebody :)
For the fonts, you need the "target" computer to have the font you used installed in its system.
For example if you set the font "arial" in your editor (because obviously you add "arial" installed), if the computer that executes the project doesn't have "arial" installed, as you said, it end in a visual mess up.
Either make sure to provide the font and have your user install it on its system before he plays your game (tedious method) or use "system fonts" (like arial as a matter of fact, fonts that will be installed by default on systems) or finaly use sprites (your text with the correct font as a picture).