Add buttons with register_page_header_buttons-hook

[th3hamm0r]

see #626

[codecov-commenter]

Codecov Report

Base: 91.88% // Head: 91.77% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (fe4eda5) compared to base (a0b7da5).
Patch coverage: 58.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #628      +/-   ##
==========================================
- Coverage   91.88%   91.77%   -0.12%     
==========================================
  Files          46       46              
  Lines        3944     3950       +6     
  Branches      595      596       +1     
==========================================
+ Hits         3624     3625       +1     
- Misses        188      192       +4     
- Partials      132      133       +1     

Impacted Files	Coverage Δ
wagtail_localize/wagtail_hooks.py	84.56% <58.33%> (-2.62%)	⬇️

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