You are looking at the HTML representation of the TXT format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the TXT format, set format=txt.
See the complete documentation, or API help for more information.
Array
(
    [query] => Array
        (
            [namespaces] => Array
                (
                    [-2] => Array
                        (
                            [id] => -2
                            [case] => first-letter
                            [*] => Mediji
                            [canonical] => Media
                        )

                    [-1] => Array
                        (
                            [id] => -1
                            [case] => first-letter
                            [*] => Posebno
                            [canonical] => Special
                        )

                    [0] => Array
                        (
                            [id] => 0
                            [case] => first-letter
                            [*] => 
                            [subpages] => 
                            [content] => 
                        )

                    [1] => Array
                        (
                            [id] => 1
                            [case] => first-letter
                            [*] => Razgovor
                            [subpages] => 
                            [canonical] => Talk
                        )

                    [2] => Array
                        (
                            [id] => 2
                            [case] => first-letter
                            [*] => Suradnik
                            [subpages] => 
                            [canonical] => User
                        )

                    [3] => Array
                        (
                            [id] => 3
                            [case] => first-letter
                            [*] => Razgovor sa suradnikom
                            [subpages] => 
                            [canonical] => User talk
                        )

                    [4] => Array
                        (
                            [id] => 4
                            [case] => first-letter
                            [*] => Rock Scena SB
                            [canonical] => Project
                        )

                    [5] => Array
                        (
                            [id] => 5
                            [case] => first-letter
                            [*] => Razgovor Rock Scena SB
                            [subpages] => 
                            [canonical] => Project talk
                        )

                    [6] => Array
                        (
                            [id] => 6
                            [case] => first-letter
                            [*] => Datoteka
                            [canonical] => File
                        )

                    [7] => Array
                        (
                            [id] => 7
                            [case] => first-letter
                            [*] => Razgovor o datoteci
                            [subpages] => 
                            [canonical] => File talk
                        )

                    [8] => Array
                        (
                            [id] => 8
                            [case] => first-letter
                            [*] => MediaWiki
                            [canonical] => MediaWiki
                        )

                    [9] => Array
                        (
                            [id] => 9
                            [case] => first-letter
                            [*] => MediaWiki razgovor
                            [subpages] => 
                            [canonical] => MediaWiki talk
                        )

                    [10] => Array
                        (
                            [id] => 10
                            [case] => first-letter
                            [*] => Predložak
                            [subpages] => 
                            [canonical] => Template
                        )

                    [11] => Array
                        (
                            [id] => 11
                            [case] => first-letter
                            [*] => Razgovor o predlošku
                            [canonical] => Template talk
                        )

                    [12] => Array
                        (
                            [id] => 12
                            [case] => first-letter
                            [*] => Pomoć
                            [canonical] => Help
                        )

                    [13] => Array
                        (
                            [id] => 13
                            [case] => first-letter
                            [*] => Razgovor o pomoći
                            [subpages] => 
                            [canonical] => Help talk
                        )

                    [14] => Array
                        (
                            [id] => 14
                            [case] => first-letter
                            [*] => Kategorija
                            [canonical] => Category
                        )

                    [15] => Array
                        (
                            [id] => 15
                            [case] => first-letter
                            [*] => Razgovor o kategoriji
                            [subpages] => 
                            [canonical] => Category talk
                        )

                    [150] => Array
                        (
                            [id] => 150
                            [case] => first-letter
                            [*] => Kolumna
                            [canonical] => Kolumna
                        )

                    [151] => Array
                        (
                            [id] => 151
                            [case] => first-letter
                            [*] => Razgovor o kolumni
                            [canonical] => Razgovor o kolumni
                        )

                    [152] => Array
                        (
                            [id] => 152
                            [case] => first-letter
                            [*] => Aktualno
                            [canonical] => Aktualno
                        )

                    [153] => Array
                        (
                            [id] => 153
                            [case] => first-letter
                            [*] => Razgovor o aktualno
                            [canonical] => Razgovor o aktualno
                        )

                    [154] => Array
                        (
                            [id] => 154
                            [case] => first-letter
                            [*] => Najava
                            [canonical] => Najava
                        )

                    [155] => Array
                        (
                            [id] => 155
                            [case] => first-letter
                            [*] => Razgovor o najavi
                            [canonical] => Razgovor o najavi
                        )

                    [156] => Array
                        (
                            [id] => 156
                            [case] => first-letter
                            [*] => Osvrt
                            [canonical] => Osvrt
                        )

                    [157] => Array
                        (
                            [id] => 157
                            [case] => first-letter
                            [*] => Razgovor o osvrtu
                            [canonical] => Razgovor o osvrtu
                        )

                    [274] => Array
                        (
                            [id] => 274
                            [case] => first-letter
                            [*] => Widget
                            [canonical] => Widget
                        )

                    [275] => Array
                        (
                            [id] => 275
                            [case] => first-letter
                            [*] => Widget talk
                            [subpages] => 
                            [canonical] => Widget talk
                        )

                )

        )

)