Measurement unit abbreviation enhances

Include `national_measurement_units` as part of `formatted_base`
Include `national_measurement_units` as part of `base`

`national_measurement_units` won't be serialised anymore to frontend
Merge pull request #196 from bitzesty/measurement-unit-abbreviation-enhances

Measurement unit abbreviation enhances
show missing abbreviation tags for measurement abbreviations
Merge pull request #198 from bitzesty/measurement-abbreviations-enhances

show missing abbreviation tags for `ps/t` abbreviation