UI will present with strange strings on custom theme as shown here

To resolve this behavior, you must copy any custom labels for schemas from "/var/netscaler/logon/LogonPoint/custom/strings.en.json" into "/var/netscaler/logon/themes/<custom_theme_name>/strings.en.json"

Note: For language localization, the filename strings.en.json refers to English strings, and there are other files for other locales, such as 'de'. Hence, to fix this for other languages, one would need to follow the below but replace 'en' in "strings.en.json" with 'de' or other appropriate locale designation for the respective locale. For example: strings.de.json

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Problem Cause

Custom themes and Custom LoginSchemas do not work together by default, this is expected behavior. This occurs because Labels for customized schemas are stored in /var/netscaler/logon/LogonPoint/custom/strings.en.json while when there is a custom theme, labels (customized, if any) are read from /var/netscaler/logon/themes/<custom_theme_name>/strings.en.json.

Customized Labels for Extensibility https://docs.citrix.com/en-us/citrix-adc/13/aaa-tm/multi-factor-nfactor-authentication/nfactor-extensibility.html