A translation status. Indicates an item that has already been translated and for which the source text has changed (modified in the source file) since the time the translation was entered.
The changed source data/text requires an edit/update to the existing translation. Or, alternatively, to confirm the validity of the translation, either by saving the item or by selecting a translation status other than 'changed source.
The indication for
changed source data/text is a red dot 
or red colored text.