review: add Video Memory text input to winecfg Graphics/Direct3D tab

[Vit Hrachovy]

Hi,
the attached patch adds new editable combobox input 'Video Memory size'
for Graphics/Direct3D tab of winecfg. 

I've tried to implement Frank's comments to English language only.
Please consider this patch as a proposal, so if it gets positive review,
I'll propagate the changes to all remaining language resources.

May I kindly ask someone for the patch review?
Regards
Vit