Add localization mechanism for authentication errors

[phloux]

The goal of this PR is to add localization for authentication errors.

After updating the authentication flow on Tchap, we noticed that the authentication errors were not translated anymore in other languages than English.

This PR add the translation mechanism used in Tchap.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Base: 11.77% // Head: 11.76% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (83baeb5) compared to base (ef8a9be).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7131      +/-   ##
===========================================
- Coverage    11.77%   11.76%   -0.01%     
===========================================
  Files         1620     1621       +1     
  Lines       159318   159364      +46     
  Branches     64818    64851      +33     
===========================================
  Hits         18752    18752              
- Misses      139928   139974      +46     
  Partials       638      638              

Flag	Coverage Δ
uitests	54.84% <ø> (+<0.01%)	⬆️
unittests	5.98% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Riot/Categories/MXError.swift	0.00% <0.00%> (ø)
...ator/AuthenticationChoosePasswordCoordinator.swift	0.00% <0.00%> (ø)
...ator/AuthenticationForgotPasswordCoordinator.swift	0.00% <0.00%> (ø)
...n/Coordinator/AuthenticationLoginCoordinator.swift	3.84% <0.00%> (-0.02%)	⬇️
...ordinator/AuthenticationReCaptchaCoordinator.swift	0.00% <0.00%> (ø)
...inator/AuthenticationRegistrationCoordinator.swift	3.84% <0.00%> (-0.02%)	⬇️
...rdinator/AuthenticationSoftLogoutCoordinator.swift	6.52% <0.00%> (-0.05%)	⬇️
...s/Coordinator/AuthenticationTermsCoordinator.swift	0.00% <0.00%> (ø)
...dinator/AuthenticationVerifyEmailCoordinator.swift	0.00% <0.00%> (ø)
...inator/AuthenticationVerifyMsisdnCoordinator.swift	0.00% <0.00%> (ø)
... and 3 more

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[aringenbach]

LGTM