[open-formulieren/open-forms#4600] Language switch now triggers an page reload

[robinmolen]

This is to make sure that all language elements will be translated to the newly selected language

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.64%. Comparing base (2633c1f) to head (10a1ea4).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #715      +/-   ##
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+ Coverage   77.27%   77.64%   +0.37%     
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  Files         233      233              
  Lines        4752     4773      +21     
  Branches     1283     1300      +17     
==========================================
+ Hits         3672     3706      +34     
+ Misses       1047     1034      -13     
  Partials       33       33              

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[sergei-maertens]

unfortunately this approach is too naive - we can only trigger this in the backend project where we know what the full page looks like, but on pages (like a CMS) outside of our control where the form is embedded, we must play nice and not take over control of the whole page.

I think adding an option to accept a callback to invoke when the language change is done/requested is the best approach, so that anyone who wishes to can hook into this to do the necessary thing.

[robinmolen]

TODO in SDK:

• Add an property onLanguageChange that can be set by the implementation.

TODO in open-forms:

• Add onLanguageChange page reload to /src/openforms/forms/templates/forms/sdk_snippet.html

[sergei-maertens]

Backports:

• stable/2.4.x: 62a15ea
• stable/2.3.x: eb71900