Remove usage of deprecated TEX_USEALPHA from GE code

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53585 954f8c5b-7b00-dc11-b283-0030488c597c
Remove some uneeded/irrelevant "PROP_TRANSLATE".

This sub-type is actually *only* needed for the "text" property of UI rna api (maybe we should rename it to "PROP_PY_TRANSLATE", as it is anyway only 'active' during conversion from py string to RNA string property...). In fact, I think it should only be used in RNA func properties anyway, as it stores the translated string into the property, it should only be used with "one time" RNA stuff...

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@53586 954f8c5b-7b00-dc11-b283-0030488c597c