Language handler: add Burmese manually as it is not recognized in Windows 7 (#8545)
* Language handler: add Burmese manually as it is not included in Windows 7.
Burmese (my) is recognized starting with Windows 8. Because NVDA also runs on Windows 7, add this language manually.
* What's new: add bug fix entry for Burmese+Windows 7. Re #8544.