No
A manuscript is any handwritten document. They can be written in any language.
Did any mississippian tribes have a written language
Linux supports any written language: it understands Unicode natively, so it can display the characters of any language with the appropriate locales included. As far as programming languages, Linux is written in C, but almost any language, from assembly to C to C++ to Python to Perl to .NET can be used on it.
The content should be perfectly written (or close to perfectly written!). Spelling errors are not OK. Punctuation needs to be spot on. Grammar should be excellent.1
Well-written well-commented code should be perfectly readable by anyone fluent in the language being used. Poorly-written and undocumented code will be extremely hard to follow.
C++ (or any other C language) encourages structured programming. I'm not sure if you are asking for an 'object oriented language' rather than structured. If that's the case, any C language or Java would fit the description perfectly.
It is a ancient writing and it is not known exactly what language it was originally written in. It is generally accepted as a ancient writing and its not linked to any one language or culture.
Certainly, Mahabharata is an epic poem written India sanskrit. It is the biggest poem known to mankind In any language.
Like many languages, English is a language that is fairly easy to speak very well. Perfectly? - I doubt that anybody speaks English perfectly! But seriously, languages are always evolving, so it is impossible to say what is 'perfect' at any given moment.
As far as I can tell from my own experience, there is no online translation tool which provides for 100% accurate translation.
Haikus are poems. They don't speak. They originated in Japan, but they can be written in any language.
"Love In Any Language" might not have been written and composed SPECIFICALLY for Sandi Patti, but her interpretation of it on the album Morning Like This, which she released on the WORD International Records label, is considered the definitive version.