Can't get text file created by me (JavaScript)

Welcome, I have a problem with getting text files I created. I wanted my game to find all text files that contain language data, because I want my game to be multilingual. I created files "LanguageVersions.txt", "Polski.txt", "Slovensky.txt" and "English.txt" and wanted them (except the first one which is not listed) to be in that order. The problem is that I am not able to list them in order I want, because Unity can't get these files.

I decided to create a string array which will get paths of all files in the directory and then reorder them. The code is below. I tried to do this by checking paths if they contain the name of the language file. It can only do it with English one.

Can anyone help?

         Reader          = new StreamReader (Application.dataPath + "/Localisations/LanguageVersions.txt" );
         FileData        = Reader.ReadToEnd();
         Reader.Close ();
     
         FileLines = FileData.Split("\n"[0]);
         for (var i = 0; i < FileLines.Length; i++) {
             FileLine = FileLines[i];
             if (!Languages.Contains (FileLine)) {
                 if (FileLine.Contains ("<d>")) {
                     if (DefaultLanguage == "" ) {
                         DefaultLanguage  = FileLine;
                         DefaultLanguage  = DefaultLanguage.Replace ("<d>", "");
                         DefaultLanguageID= i;
                     }
                     FileLine = FileLine.Replace ("<d>", "");
                 }
                 Languages.Add (FileLine);
             }
         }
         LanguagePaths  = Directory.GetFiles (Application.dataPath + "/Localisations/", "*.txt");
         LanguagePathsC = new String [Languages.Count];
         for (var p  : int = 0; p  < Languages.Count; p++ ){
             for (var lp : int = 0; lp < LanguagePaths.Length; lp++ ) {
                 if (LanguagePaths [lp].Contains (Languages [p])) {
                     LanguagePathsC [p] = LanguagePaths [lp];
                 }
             }
         }
         LanguagePaths = new String [LanguagePathsC.Length];
         for (var lpn : int = 0; lpn < LanguagePathsC.Length; lpn++ ) 
             LanguagePaths [lpn] = LanguagePathsC [lpn];