Helper text for 'number-slider' questions is always displayed in English for surveys translated to a non-European language

[MavromatisK]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to the editor page of your survey
2. Add a 'number-slider' question to your survey
3. Only allow values above 1
4. Save your survey
5. Create a translation to a non-European language (e.g. Serbian - SR)
6. Translate all available text to your non-European language
7. You are not able to translate the text saying "Only values of at least 1 are allowed"

Expected behavior
The translation pop-up should allow the editor to translate this helping text into their own non-European language.

Screenshots

Desktop (please complete the following information):

• OS: Windows 10
• Browser: Chrome
• Version: 89

Smartphone (please complete the following information):

• Device: n/a
• OS: n/a
• Browser: n/a
• Version: n/a

Additional context
Add any other context about the problem here.

[BRU-EUSurvey]

Hi there,
Thank you - This is indeed a known issue.
There are some system label (also in the right-panel of the Form Runner) which are currently not translatable.
This has been requested by many users who want to have a survey in full serbian, russian, israeli etc.
All of this system labels need to be part of the translation module to allow the user to add his own translations.
Kind regards

[BRU-EUSurvey]

FYI ticket 6985 has been created for this.
Planned for version 1.5.3.