Well I don't have experience with gitlab.com, I try to ask as few question as I can:
1. Do I have to add the limesurvey-autocomplete.js from
gitlab.com/SondagesPro/QuestionSettingsT...-autocomplete.js#L29
at the end of my autocomplete question?
2. Do I have to add the limesurvey-autocomplete.css from
gitlab.com/SondagesPro/QuestionSettingsT...vey-autocomplete.css
to the end of custom.css in my theme?
3. Where do I have to add the path to the csv lists where the autocomplete entries are stored? I don't know, I tried to find something like:
var url = surveyRoot+"upload/themes/survey/extends_bootswatch/autocomplete_list.csv";
4. Where do I have to add the code for the trigger action of your previous post?
If it's less complicated instead of answering these questions, rather adapt the test survey (.lss).