#1127 Naming typo in MUI2 (VARAIBLES)

[Anton Samsonov]

There are 2 instances of the word “VARAIBLES” in Contrib\Modern UI 2:

1. Localization.nsh mentions MUI_LANGDLL_REGISTRY_VARAIBLES;
2. Pages\Finish.nsh mentions MUI_FINISHPAGE_SHOREADME_VARAIBLES.
   Although these names are used consistently, and googling suggest that it might be a proper spelling in some other language, I suspect these were typos and may lead to bugs in the future, as all other preprocessor constants are named in English.