Placeholder texts in date convertor are not RTL

[xashyar]

Hi,

Thanks for making this great extension.

I just noticed one minor issue, and that is the alignment of placeholder text inside date converter fields, as you can see below they are treated as LTR:

[omid]

Hey,

I couldn't find a way to make them RTL, in the past.
I would appreciate it if you could create a PR if you found a solution.