feat: added language specific default

[martijn788]

🔎 Overview

Added a feature to add a language specific default.
Current behaviour was always an English message.

Logic:
if for the specific language a _default is set, then show that default.
If there is no default set, the fallback-english is used.

[codecov-commenter]

Codecov Report

Merging #3501 (b8aac6c) into main (87df597) will decrease coverage by 0.05%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #3501      +/-   ##
==========================================
- Coverage   96.71%   96.65%   -0.06%     
==========================================
  Files          65       65              
  Lines        1613     1616       +3     
  Branches      394      398       +4     
==========================================
+ Hits         1560     1562       +2     
- Misses         52       53       +1     
  Partials        1        1              

Impacted Files	Coverage Δ
packages/i18n/src/index.ts	75.00% <66.66%> (-0.56%)	⬇️

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[logaretm]

That's a nice addition, thank you!