I have been able to edit the .tsr file within the editor itself without any problems.
Choose "Language Localization" in the "Mission" dropdown. Highlight the desired option: mission title; mission briefing; or objective. Then simply type your text in the bottom box for each...and then save.
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"Sink 'Em All!"- Uncle Charlie....."Angriff, Ran, Versenken!"- Onkel Karl
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