This thread is resolved. Here is a description of the problem and solution.
Problem: Is there a way to delete more than 100 strings at 1 time?
Solution: 1) You can go to string translation and click on "show all results" 2) if this doesn't work there are no any options to select more than 100 strings at once. 3) The user mentioned that if you add &strings_per_page=1000 to the URL then this works.
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