Enable V-Sync option by default

[Tiagoquix]

See #359. I think it's fine to enable it, so here's my PR. Also done some misc. changes to strings.

I believe I changed all the correct files.
Not sure if this one needs to be changed:

cnc-ddraw/src/render_ogl.c

Lines 119 to 120 in 33f2b91

	if (got_swap_ctrl && wglSwapIntervalEXT)
	wglSwapIntervalEXT(g_config.vsync ? 1 : 0);

(I believe it does not).

Thanks!