feat: export aliases t and n for translate and translatePlural

[ShGKme]

We do this all the time:

import { translate as t, translatePlural as n } from '@nextcloud/l10n'

This PR allows importing aliases as well in a simple way:

import { t, n } from '@nextcloud/l10n'

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1388a39) 86.17% compared to head (9a355a4) 86.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #727      +/-   ##
==========================================
+ Coverage   86.17%   86.31%   +0.14%     
==========================================
  Files           6        6              
  Lines         188      190       +2     
  Branches       67       67              
==========================================
+ Hits          162      164       +2     
  Misses         23       23              
  Partials        3        3              

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