Marker Placement - Show Current Channel

Shows exactly what channel a marker will be placed on.

![markerchannel](https://cloud.githubusercontent.com/assets/9376747/5138797/5c6daa38-711a-11e4-925c-3693bb1981a1.png)


Far too often in TvTs we get side markers in global.  There's no way to check channel without switching back and forth.
This buffers the channel's text, then shows a shortened version on the "place" button.

Other changes:
Resizes Place and Cancel buttons to make room for text.
Direction Slider changed from RscSlider -> RscXSliderH - which offers much better mouse response (in my opinion)
Prevents the box from being drawn below bottom of screen.

It needs exact translations of the 'short' version of channels. 
 I have English, German, Spanish done.  (hopefully my de/es isn't terrible)
 If no translation found then it doesn't change anything.
This is the only spanish entry that's terrible; replace by "Colocar en".

I'm pretty sure the entry is also wrong for the rest of the latin languages (French, Portuguese and Italian). I suggest removing those entries.