Translations:New Template System in LS3.x/99/en
From LimeSurvey Manual
If you already created a them for 2.x versions of LimeSurvey, you'll notice that most of them corresponds to the old pstpl files for limesurvey 2.x. Again, there is no obligation for you in your theme to create those files, with those names, in this directory. You could for example just add a giant switch in layout_global.twig with the wanted HTML for each action.