Hello,
We have a Richtextbox translated to spanisg language. The "Code view" button has it tooltip in spanish ("Ver código")
After clicking on it, the button dissapears and appears the preview button. But now he tooltip is showed in english ("Preview") not in spanish ("Vista previa") as is defined in our translation file.

Now, If we click on it, the code view button appears again but the tooltip now ("Source Code") it remains in english.

The same problem happens with the Fullscreen button. The rest of the buttons works well.
In ou translation file we have these values:
"sourcecode": "Ver código"
"preview": "Vista previa"
We noticed that the same happens on your web examples (in this case the language is German)
https://ej2.syncfusion.com/vue/documentation/rich-text-editor/globalization/
Thank you in advance for your answer and regards
Gaspar