PLANET NVR-420 - Manual (Page 31)

4.4 Changing Web UI Display Language
You can change the web UI display language from the current login
username link located at the upper-right hand corner. Click on the link to
open up a new window which displays detailed information about the
user as well as a drop-down menu which lets you change the display
language.
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4-CH H.264 Network Video Recorder with HDMI
User’s Manual of NVR-420