[#1508] My profile messages

[pi-sigma]

Links for sending messages to contacts are displayed if and only if a message page exists and is set to be published.

Taiga: #1508

[pi-sigma]

• UX: after hiding the link to send messages for active contacts in case the messaging page is unpublished, should we also get rid of the link for contacts that still need approval? Or should the link be displayed as disabled so as to signal to the user: messaging is available in principle, but for this particular contact it is temporarily disabled (current situation)?

• Implementation: the solution filters Page objects by application_namespace and checks for the first page if it is published. At first I naively assumed that the result of filtering by application_namespace would be unique, but the resulting queryset has two elements (with is_draft=True and is_draft=False respectively). Both however are is_published=True. I double-checked and noticed noticed that this is the case for every application_namespace. I'll be looking into the CMS documentation to see if I can figure out why this is (and whether the implementation is wrong), but if someone with more experience with CMS could shed some light on this, that would be great.

[codecov-commenter]

Codecov Report

Merging #654 (27023b5) into develop (6be1f1c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop     #654   +/-   ##
========================================
  Coverage    96.45%   96.46%           
========================================
  Files          618      619    +1     
  Lines        21857    21889   +32     
========================================
+ Hits         21083    21115   +32     
  Misses         774      774           

Impacted Files	Coverage Δ
.../open_inwoner/accounts/tests/test_contact_views.py	100.00% <100.00%> (ø)
.../open_inwoner/accounts/tests/test_profile_views.py	100.00% <100.00%> (ø)
src/open_inwoner/accounts/utils.py	100.00% <100.00%> (ø)
src/open_inwoner/accounts/views/contacts.py	100.00% <100.00%> (ø)
src/open_inwoner/accounts/views/profile.py	99.31% <100.00%> (+<0.01%)	⬆️

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[vaszig]

I am sorry but I now noticed that the asserts you are doing concerning the texts in the response are not translatable. There are several across the PR (I mentioned only the first one), let's fix these as well.