Language menu improvements

[Madjosz]

When hovering the language selector button, the language chooser menu appears. But it will continue to be visible until I click a language or after two seconds. This is very annoying since one often accidentally hovers the button when moving the mouse in and out the formula input field.
I suggest making this a button to click or to immediately hide this menu if the mouse is out of the button/menu.
Also all languages which were selected, stay in a "selected" style.

OS: Windows 10 Pro 10.0.18362
Surfer: 1.7.0 for Windows 32-bit

[porst17]

Development of SURFER has been discontinued. This version is build on top of a Java library that is no longer supported (JavaFX 1.3.1) such that making any changes to the UI essentially requires a complete rewrite of it. Sorry for the inconvenience.