How I convert boolean values to the words depending on the situation? For example, TRUE here means "Enabled", and FALSE there means "Failed"?

Here is the code snippet to do the job.
If the second parameter is omitted, the function returns "TRUE" or "FALSE".
Modify the function declaration to change the default returning values.
Expand TBooleanWordType and BooleanWord definitions to include more specific values if needed.

interface
[...]
type
   TBooleanWordType =
      (bwTrue, bwYes, bwOn, bwEnabled, bwSuccessful, bwOK, bwOne);
[...]
function BoolToStr (AValue: boolean;
                    ABooleanWordType: TBooleanWordType = bwTrue): string;
[...]
{=====================================================}
implementation
[...]
const
   BooleanWord: array [boolean, TBooleanWordType] of string =
      (
       ('FALSE', 'No',  'Off', 'Disabled', 'Failed',     'Cancel', '0'),
       ('TRUE',  'Yes', 'On',  'Enabled',  'Successful', 'OK',     '1')
      );

[...]
{-----------------------------------------------------}
function BoolToStr (AValue: boolean;
                    ABooleanWordType: TBooleanWordType = bwTrue): string;
begin
   Result := BooleanWord [AValue, ABooleanWordType];
end; {--BoolToStr--}
[...]