Project without title should display Untitled Project

[Xilonz]

Just like the web-app.

[MrBlenny]

@tomnlittle I suspect we need a default:
https://github.com/stemn/stemn-frontend-shared/blob/master/src/misc/Sidebar/SidebarProjectButton.jsx#L32
and
https://github.com/stemn/stemn-frontend/blob/master/electronNew/app/renderer/main/pages/ProjectPage/ProjectPage.jsx#L125

Should be 'Unititled Project'
https://github.com/stemn/stemn-frontend/blob/master/websiteNew/src/client/assets/javascripts/pages/Project/Project.js#L33