[Feature request] Add option to settings to change thousand separator

**Is your feature request related to a problem? Please describe.**
I dont like the current thousand separator - 1,000,000.

**Describe the solution you'd like**
I would like option to change the thousand separator to spaces - 1 000 000. And also to none - 1000000.

Start at the app's settings entry point and trace where displayed numbers are formatted. Verify the requested choices—commas, spaces, and no separator—against the current behavior. Done means users can select each option and displayed values use the selected formatting consistently.

Written by the indexing model from the issue text.