Hi
It's thought as a feature, but it can be a bug.
In tx_powermail_domain_model_field the page field (the parent fieldset of this field) is defined as only visible in Lang=0.
'displayCond' => 'FIELD:sys_language_uid:<=:0',
But sometimes, this value is not filled in in localised records.
Or, you want to move a field from one page to another.
I don't see how the translation relation would be updated automatically.
Shouldn't this field be visible in all languages?