How to edit text in yii2?

Question

Yii

Goodnight! A bot was written for telegrama on yii2, found an error, so it was necessary to change the text that the bot displayed, but for some reason when I changed it, the changes were not displayed (I checked through the text search, there were no more specified words in other files)
What is the problem and how to solve it, I’ll say right away that I’m not a programmer, so if you explain it clearly, I’ll be grateful)
As I understand it, there may be a problem with storing information in caches, but how to clear it ...