You can use Joomfish (in v2.0.1+) or Falang(v2.0.0+) to translate label of custom fields,
-- but in upcoming v2.0.1 you can use Joomla language strings, because the field label will be Langauge Filtered !!
So e.g.
1. Label your field "MY_FIELD_QUALITY"
2.
EITHER (a) and then add to you .ini language files:
MY_FIELD_QUALITY="Quality"
etc
OR (b) Goto Joomla language manager and add language overrides
v2.0.1 will be available in next couple of days, fixing know issues of v2.0.0 and bring among other language improvements of easier management, and a high performance items manager (large sites)
To test now this is common code so label will be translated everywhere
classes/flexicontent.fields.php
Add
$field->label = JText::_($field->label);
Just after about lines 1050-1150 :
Code:
// Set custom label, description or maintain default
$field->label= ...
$field->description = ...