Siemens SIMATIC S7-1500 System Manual page 202

CPU display
You select the required language directly at the display in the "Display" menu or in STEP 7 in
the hardware configuration of the CPU under User interface languages".
To display message texts on the display, follow these steps:
1. Download the message texts to the CPU as a software component. To do so, select the
"Consistent download" option under "Text libraries" in the "Load preview" dialog.
2. You set the project language that is to be displayed as the interface language by means
of parameter assignment. To do so, select the CPU in the Inspector window and navigate
to the "Multiple languages" area ("Properties > General > Multiple languages") and assign
the required project languages to the interface languages.
Reference
Important information/special requirements for the display of F-CPUs can be found in
Product Information F-CPUs S7-1500
(https://support.industry.siemens.com/cs/ww/de/view/109478599/en)
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Automation system
System Manual, 09/2016, A5E03461182-AD