fix(locales): add real cities for zu_ZA and af_ZA, update en_ZA city list

[matthewmayer]

Changes faker.location.city() to use real city names for af_ZA and zu_ZA, like en_ZA

Not all cities have seperate names in all three languages

Originally discussed at #2119 (comment)

[codecov]

Codecov Report

Merging #2141 (5bc55b1) into next (aab69c9) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 5bc55b1 differs from pull request most recent head 1abbde6. Consider uploading reports for the commit 1abbde6 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #2141      +/-   ##
==========================================
- Coverage   99.60%   99.60%   -0.01%     
==========================================
  Files        2605     2607       +2     
  Lines      244951   244977      +26     
  Branches     1149     1255     +106     
==========================================
+ Hits       243974   243999      +25     
- Misses        950      951       +1     
  Partials       27       27              

Impacted Files	Coverage Δ
src/locales/af_ZA/location/city_name.ts	100.00% <100.00%> (ø)
src/locales/af_ZA/location/city_pattern.ts	100.00% <100.00%> (ø)
src/locales/af_ZA/location/index.ts	100.00% <100.00%> (ø)
src/locales/en_ZA/location/city_name.ts	100.00% <100.00%> (ø)
src/locales/zu_ZA/location/city_name.ts	100.00% <100.00%> (ø)
src/locales/zu_ZA/location/city_pattern.ts	100.00% <100.00%> (ø)
src/locales/zu_ZA/location/index.ts	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes