Fixed Phrase group length check can be missleading

[Xon]

Affected version

2.0.4

The error phrase_group_titles_must_be_no_more_than_50_characters is triggered when the regex "/^[a-z0-9_]{1,50}\.[a-z0-9_]+$/i" fails to match.

This can occur if the phrase group has non-alphanumeric characters or the part after the '.' is missing