Guard against ManyToOneRel child field without help text or verbose name

[zerolab]

Fixes #284

[codecov-commenter]

Codecov Report

Base: 91.80% // Head: 91.80% // No change to project coverage 👍

Coverage data is based on head (9cdc2c6) compared to base (7c8b75d).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #620   +/-   ##
=======================================
  Coverage   91.80%   91.80%           
=======================================
  Files          46       46           
  Lines        3916     3916           
  Branches      593      593           
=======================================
  Hits         3595     3595           
  Misses        188      188           
  Partials      133      133           

Impacted Files	Coverage Δ
wagtail_localize/views/edit_translation.py	84.71% <ø> (ø)

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