me and a friend once hooked up with two german girls who didnt speak english. some thoughts:
1. If they ask you to slow down as you speak, dont slow down. If you do they become more engaged in translating than listening to you. If you speak normally they become attracted to your voice.
2. Sing songs, do impressions, make hand gestures, make funny faces, etc. Do physical rather than verbal actions to get attraction.
3. Comfort is very hard to build. Try just spending time with them lying down and watching TV or something. Talk softly and smile at them alot.
4. When escalating you have to be VERY carefull. Get your face very close and make sure theres sexual tension before you kiss her. Dont try something like kiss bet or spin kiss.
5. Hug them alot, the whole way through the PU. Stretch your arms out, say 'aaawwwwww' and give them huge hugs.