properly handle characters for JSON parsing (runtime)

[abirEF]

modify this code line that can provoke JSON parsing error
var decodedData = $('<textarea />').html(JSON.stringify(jsonContent.data)).text(); // MBG : find a better method

[bengaid]

Thanks Abir, it is indeed a better method

[abirEF]

We need to ensure that HTML entities within the json data are properly decoded (for rendering HTML elements and function calls) and also to ensure handling properly characters for JSON parsing (prevents JSON parsing errors)

[bengaid]

Thanks Abir, all other issue fixed