Scrble is translated in the following languages:

English (United States)
العربية (المملكة العربية السعودية)
Deutsch (Deutschland)
Español (España, Alfabetización Internacional)
Français (France)
Italiano (Italia)
日本語 (日本)
中文(中国)
中文(香港特別行政區)
中文(台灣)

To select the language, open Settings > Time & Language > Region & Language, then make sure your desired language is listed as first in the Languages list. In the image below, the selected language for Scrble is English.