[Feature Request] Customizable "tab" label (different from "tabs")

[JJCUBER]

I have noticed that in the tabline.vim file, the part of the tabline which shows which tab you are on out of the total (i.e. "tab 2/7") is hardcoded to say "tab":

    call a:dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))

I was originally hoping that g:airline#extensions#tabline#tabs_label would also affect this; would it be possible to add a setting to the tune of g:airline#extensions#tabline#tab_label which affects the hardcoded portion?

[chrisbra]

sure, please go ahead and create a PR for this.