Set session cookie for user's preferred language

[avazirna]

Product Description

This PR sets a session cookie to store the user's preferred language for the current session. This cookie is to be used to override the user's favourite language in subsequent HTTP requests, making sure that the chosen language persists throughout the session.
This change also requires changes to the frontend, so another PR will be linked to this one.

Safety Assurance

Safety story

Automated test coverage

QA Plan

Special deploy instructions

• This PR can be deployed after merge with no further considerations.

Rollback instructions

• This PR can be reverted after deploy with no further considerations.

Review

• The set of people pinged as reviewers is appropriate for the level of risk of the change.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.20%. Comparing base (bb7cdbb) to head (870aaf9).
Report is 39 commits behind head on master.

Files with missing lines	Patch %	Lines
...ommcare/formplayer/application/MenuController.java	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1648      +/-   ##
============================================
- Coverage     70.22%   70.20%   -0.02%     
+ Complexity     2007     2005       -2     
============================================
  Files           254      254              
  Lines          7902     7905       +3     
  Branches        745      744       -1     
============================================
+ Hits           5549     5550       +1     
  Misses         2070     2070              
- Partials        283      285       +2     

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[snopoke]

nit: Constants is already imported:

Suggested change

	@CookieValue(value = FORMPLAYER_SESSION_LANGUAGE, required = false) String sessionPrefLang,
	@CookieValue(Constants.FORMPLAYER_SESSION_LANGUAGE, required = false) String sessionPrefLang,

[snopoke]

I don't follow what's going on here. We're resetting the cookie value if it doesn't match what's being sent in the request body. But the value in the request body is coming from the cookie right (unless the cookie is empty in which case the first part of the condition is met)?

[avazirna]

The decision was to use the localStorage instead of cookies, so this is no longer needed.