After string refresh module deleted also strings which were used and usefull:

After string refresh it deleted also strings which were used and usefull:

Performing cleanup for text group field, deleting 11 left over strings.
Successfully refreshed 323 strings for Fields
Deleted 11 left over strings.

Some translations of field names (labels) within field module were deleted, some were left intact. One text field was left intact, others have deleted label translation for all languages.

- I use several single fields for multiple content types.

Similar: #2286651: Field labels&descriptions are lost on string refresh