This would impact all questions with "other" in all surveys. If this is what you want, then "translating" is the way to go.
But I guess this is just for this specific question type and for this specific question. Then the best is to change it in "Display options" in the question settings ("edit").
I answer at the LimeSurvey forum in my spare time, I'm not a LimeSurvey GmbH employee.
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