I will take a look at it and edit this post when I am done playing through your map.
[edit]
Aw... quite a short one.
You know what actually scared me in your map? That nothing was happening in the first room. I had to search like 2 minutes until I found the key, during that time I thought the door would just jump open and a monster appears.
I didn't find any clipping errors. There are 2 other things I found though:
- You should move the doorframes a bit more into the room since you can still see parts of the wall through the frame.
- Don't use the ceiling texture you used above the stairs, it looks terrible.
I will take a look why your entries don't work, will do another edit after that.
[edit #2]
Uff... it actually took me 15 minutes to figure what was wrong with your extra_english.lang file.
You wrote
<EntryName="Upstairs">Upstairs</Entry>
There is a space missing between Entry and Name, it should be
<Entry Name="Upstairs">Upstairs</Entry>
That little mistake made your whole file broken. :/
Updated my post.