where i can find this language file?

Question

Hello

i need change this note "A question with this title already exists. Please add more details." to another language 

but i can't find this statement in any folder in the files 

Hint:this note appear when the user trying to add question with title the same for another question

Answer 1

That's in here. But bear in mind, you have modified the text, as it actually is:

Your submission appears to be a duplicate.

Comments

No, this text exists as is and has not been modified
Do you think there is a plugin that made this change?

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How do you know it "exists as is"?

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I am talking about "Your submission appears to be a duplicate."
this text exist in "qa-lang-question.php" and not modified.

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Plugins do not modify files, in general. It is most likely you have changed it and you forgot about it

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Or a custom language file might be in use

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@pupi1985 I have checked it but it is not modified.

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Then you might either be using a plugin (probably this one: https://github.com/ganbox/qa-filter) or you might have modified the core files