Hello

Added HTML5 support to Quanta via https://mirror.git.trinitydesktop.org/gitea/Alexis/tdewebdev/pulls/1

With this contribution is possible in Quanta to select HTML5 as DTD (Menu DTD > Change DTD > HTML5) and the new toolbars will be displayed with new icons that will insert the corresponding tag. The templates are also ready. The names used for the toolbars were already in the translation file, it is not necessary to add new translations to have it e.g. in Spanish.

Things to do:
* The "dtep" need to be improved (traces of HTML4 have remained). I can do it little by little in my spare time, of course help is welcome to speed it up.

* "Source editor" mode is fully functional. "Preview" mode works (actually only the common tags between HTML4 and HTML5 work but it encompasses all the most used ones, the HTML engine I guess doesn't support HTML5). The "VPL editor" mode refuses to activate if HTML5 is selected as DTD (no crash, just not activatable). It may take some (perhaps a lot of) work to achieve this (and unfortunately it is beyond my current capabilities).

* With HTML4 as default DTD, opening a new tab with the new document (HTML4) adds the HTML4 toolbars to the HTML5 toolbars (9 toolbars in total). I'm not sure why, it may be easy to fix. With Menu DTD > Change DTD > HTML5, the extra HTML4 toolbars disappear.

Best regards!