To customize Texts, you can go to localization tables, it are there ( the "problem" will be that it will change TW System wide ):
- on and off Tokens
- refresh / refreshNow Tokens
About the colors you should play around with FocusStyle/TimeBGStyle/TimeDatePickerStyle/TimeAutoRefreshStyle/TimeRefreshBtnStyle Style properties.
If you want to go beyond that customization options, then you can create your own Time Selector widget as an extension based on current Time Selector code, we already did it to support TimeZone and it's not hard once you are used
I have one more question but I guess I must open a new discussion for this:
what about if I am making my own widget which among its properties has a label and I want to be a Localization Token?
What should I set into the characteristics of the property in order to be seen the little globe left to the property name?