Which languages are some apps made

I would assume in the language of the programmer. In the end it does not matter because the compiler translates to the language the processor understands. The code the author writes in is just an intermediate step. Most of the source I see is in English probably because where most of the programming started many years ago. You can look at the comments, they are generally but not always in the language of the programmer.

I found this on the internet:

Code is in English mostly because of history, standardization, and practicality, not because English is inherently better for programming.

Here’s the breakdown:

  1. Historical Roots

    The earliest modern programming languages (FORTRAN, COBOL, BASIC, C) were developed in the United States and Western Europe.

    The inventors wrote the commands and syntax in English — e.g., IF, PRINT, GOTO, FOR.

    Once a standard was set, it became difficult to change without breaking compatibility.

  2. International Standardization

    Using one dominant language (English) avoids fragmentation where each country has its own keywords.
    
    It means code written in Japan can be read and compiled the same way in Germany or Brazil without translation.
    
  3. ASCII Character Set

    Early computers used ASCII, which originally encoded only the basic Latin alphabet — essentially the English letters.
    
    Supporting keywords in many scripts (Arabic, Cyrillic, Chinese, etc.) wasn’t practical in early hardware/software.
    
  4. Collaboration & Documentation

    Most technical documentation, academic papers, and open-source projects are in English.
    
    Using English keywords means developers from different countries can share code more easily.Programming Languages Separate Logic from Local Language
    
        Code keywords stay in English, but variable names, comments, and strings can be in any human language.
    
        This keeps the structure universal while letting you localize the parts humans see.
    

Hopefully this helps.