The calculator I always wanted

[vanLudwig]

I just pushed out BETA 4. I'm hoping this is the final BETA.

• Use the ƒ tool to apply function heads to arbitrary parameters
• Added popup help for selection-based RPN operations
• Fixed algebra popup menu going behind camera cutouts
• Fixed error saving floating-point numbers during application exit
• Human-translated dialogs to German (thanks Demosthenes)
  

RPN example of new ƒ capabilities:

• CATALOG -> Constants -> Function Heads -> D-G -> EasterSunday
• Type 2019 on the console
• Select EasterSunday on the stack and 3rd -> ƒ
• Result: {2019, 4, 21}
  

WYSIWYG example of new ƒ capabilities:

• CATALOG -> Constants -> Function Heads -> D-G -> EasterSunday
• 3rd -> ƒ
• Type 2019 and ENTER
• Result: {2019, 4, 21}
  

You need to know the expected parameters in order to use function heads this way; Acron Calculator doesn't do any parameter verification. You can usually look them up on reference.wolfram.com. No guarantees that Symja actually supports all these functions, though.