Say "Context help" not "Help viewer"

Author: alanocallaghan

src/main/resources/qupath/ext/training/ui/tour.properties

@@ -168,10 +168,10 @@ toolbar.log.text = Open QuPath's log viewer.\n\n\
 toolbar.log.text.info = If you a reporting a bug in QuPath, it usually helps to include the exact text of any \
     error messages you find the log.
 
-toolbar.help.title = Help viewer
-toolbar.help.text = Open QuPath's 'Help viewer'.\n\n\
+toolbar.help.title = Context help
+toolbar.help.text = Open QuPath's 'Context help'.\n\n\
   This makes it easier to read any help text available when you put your cursor over something.\n\n
-toolbar.help.text.info = The 'Help viewer' also tries to help figure out when things could be confusing \
+toolbar.help.text.info = The 'Context help' also tries to help figure out when things could be confusing \
   (e.g. errors in the log, or objects are hidden).\n\
   A little colored badge appears in the corner of the button when it has information it wants to tell you.