Translations:New Template System in LS3.x/10/en
From LimeSurvey Manual
In LS3, a theme can now inherit from another theme, it can “extend” another theme. This means that the theme directory will be practically empty, it will only contain the files (views, style sheets, scripts, resources etc.) that differ from the original ones. Doing so, it will be easy for you to create a fleet of themes for your different users without having to maintain a lot of different themes. For example: you can have your own home-made theme, and then a version for a company (with its logo, its style, maybe a link to its website on the footer etc.), another version for another company etc. If then you update the CSS or the global layout of your custom theme, all the themes that inherit from it will be updated automatically. Note that the inheritance is recursive: a theme can extend a theme that extends another one etc.