Rename JDK to Java in messages shown to user

[valfirst]

JDK is not required, JRE is enough. JDK is renamed to Java in messages show to users to make them less restrictive.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.54%. Comparing base (326c62b) to head (eb99f3b).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #692   +/-   ##
=========================================
  Coverage     87.54%   87.54%           
  Complexity      273      273           
=========================================
  Files            35       35           
  Lines          1044     1044           
  Branches         72       72           
=========================================
  Hits            914      914           
  Misses          119      119           
  Partials         11       11           

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