picker Improved Burmese localization

I'm not sure whether this localization was added by a native speaker. I'm a native speaker, so I would like to improve for better understanding and readability.

The word အပတ် has more than one meaning (for example count of the rotations) and it's ambiguous to use for the week. But the word သီတင်းပတ် has only one meaning which is for time measurement, so it's more suitable and easy to understand.

And there's no need to have space unless for a phrase or sentence. Example: it's better to have space for writing the phrase အချိန်ကို ရွေးမည်, but better without space for အချိန်ကိုရွေး.