Standardize empty select item texts on all UIs for Saas & Language Management modules #15093
Description
https://github.com/abpframework/abp/pull/17494 -> Merge the PR before checking this PR (localizations)
Resolves #15083, resolves #15077
@masumulu28 Can you make the related changes on Angular side for standardizing the empty select item texts?
Checklist
- I fully tested it as developer / designer and created unit / integration tests
- I documented it (or no need to document or I will create a separate documentation issue)
- I worked with the design team to get their idea for UI/UX design (or no need to design for this PR)
- I've assigned reviewer, related labels and set a milestone for this PR