You can modify the source content of a TXLF file, since you can restore the original source content at any time. To update the translation memory (TM), commit the edited source segments.
To edit a source segment:
In TXLF Editor, select a source segment.
On the Edit tab, click Edit Source.
Edit the source content, then click outside the segment.
The source segment is saved and the is displayed in the Status column.
To return to the original source, click Revert Source.
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