Please help us help you and fill where relevant:
Your LimeSurvey version: [see right hand bottom of your LimeSurvey admin screen]
Own server or LimeSurvey hosting: University of Southern Queensland
Survey theme/template:
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Can anyone tell me if it is possible to change the wording that is automatically generated on the Captcha for the survey please? 

Currently LimeSurvey automatically generates, "Before you start, please prove that you are human," and we are hoping to change this. A screenshot is attached. 

I have not been able to locate the version of LimeSurvey that my university uses and ICT were unable to tell me. 

Thank you in advance.

If you can't even find out what the version of LS is and ICT (who ever that is) can't tell you either, then you most probably also don't have permission to change themes, translations or use Javascript. So I see little to no chance that you will be able to change this as a "normal" student, and given that ICT (I assume this is IT support) can't even tell you what version they are running, I have my doubts that they would be able to do this either.

The version of LImesurvey can usually be found on every page on the LS backend (when you are logged in) in the bottom right corner and if for some reason someone adapted the admin template and deleted this, then you can still find it in the section "comfort update" as a super admin (probably ICT). But if they can't tell you the version, they are either not capable or not willing to help with such a basic request like the version.

This also tells me that the version the university is running is most probably complete out of date.

I managed to locate the version. It is 3.285. If I have checked correctly, I think this was released in 2017.

I assume it is 3.28.5, because 3.285 doesn't exist.

If it is 3.28.5 it is actually not that bad, it was released in 05.04.2022:
community.limesurvey.org/release/220405/

So "only" 1 year without updates. For a university installation actually not the worst case.

These texts are within the language files, so you would need to change the language files.

Here is the string: translate.limesurvey.org/projects/limesu...original_id%5D=33019

So you basically would have to adapt the language file of your installation (which I doubt that the university will allow). These changes will have an impact on all surveys of the installation / university.

Another option is sometimes to adapt the survey theme accordingly, so you need to check if you have rights to create your own theme / copy a theme and adapt it. Have a look in the GUI if you can access the Theme editor.