Coding languages topic

Hi guys, can anyone explain to me why you can have different coding languages? I am going to try and explain it the best way possible. Pretty much I want to know why some people use other coding languages instead of others? Are some better for particular activities? Like I know cross compatibility like you can't use html to code a game online you need to use Flash or Javascript etc.

tl;d why use one language over another?

[Q] Get All Supported Languages (Including Keyboard), No Root topic

Hi,

Background:

Quote:

I bought a new Galaxy S4 GT-I9505 and I it came without my natural language. So I downloaded MoreLocale 2 to change the language to whatever I want, but then I found out that MoreLocale 2 has no permissions. After searching and reading about that I granted the application the permission it needed (via ADB), so I wouldn't need to root my phone. And it works FINE. But then I found out that I can't find my language on Samsung keyboard. And I know that even with phones from another region, you can find all supported languages in the keyboard. So I guess that Samsung now restrict that by showing you only the languages that came with the phone.

Then I found this app: Language Enabler that, from what I understand, should show you all languages in the settings menu.
Now I have 2 questions:
1. Does this app show all languages in the keyboard too?
2. How can I launch this app without rooting my phone? Can I grant a permission like I did with MoreLocale 2?

Thank you very much in advance for everyone who'll try to help me.