Small UI changes

[Gergely Szabó (Schámi)]

• üdvözlünk -> pattern | home.welcomeMessage (text), home.content (markdown)
• force dark mode | style.forceDarkMode
• footer small edition | app.minimalisticFooter
• logo cannot be changed | style.lightLogoUrl, style.darkLogoUrl
• login menu | login.onlyBmeProvider, login.langLoginMenu
• font is broken after some site changes
• backround should not depend content height rather viewport and scroll with the browser

[Bálint Berente]

IDK about the font