Basically, I wonder if it's possible to set up different end messages (I'm talking of Text Elements > End Message) according to the number of full responses the survey already had. 
Thank you to anyone who will be willing to help me. 

LimeSurvey version number ?
www.limesurvey.org/manual/StatFunctions

3.27.22, I don't think that's available for me.

Unfortunately there is a built-in plugin to access the other responses since version 5.x.
But in 3.x. you may use the plugin "getStatInSurvey"
[url] gitlab.com/SondagesPro/ExportAndStats/getStatInSurvey [/url] 

Joffm

Unfortunately there is a built-in plugin to access the other responses since version 5.x.

Why is this unfortunate?

I think it is great.

holch wrote:

Unfortunately there is a built-in plugin to access the other responses since version 5.x.

Why is this unfortunate?

I think it is great.
 

Because it's a good reason to update ?

Else : with gitlab.com/SondagesPro/ExportAndStats/getStatInSurvey   plugin : i think it update only question part, don't remind of End text (or welcome)