how to change the "new incident" to "new request" ?

how to change the "new incident" to "new request" ?

hi all,
   I 'm a newer for service desk, now for our company's specific requirement, we need to change the "incident" to "request"(cause incident is a "serious" word, for our area relate, this word is not suit) when someone generate a ticket, I check the admin profit file, but can't find where to change this, could and one help me to change that ? thanks.

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