Zoom’s language for the UI is determined by the default operating system on a user’s device. Zoom client supports the following languages:

• Chinese (Simplified and Traditional)
• English
• French
• German
• Japanese
• Portuguese
• Russian
• Spanish
• Korean

More details here on Zoom support site: https://support.zoom.us/hc/en-us/articles/209982306-Change-your-language-on-Zoom