<?php
$dados = [
  [
    "('2615509767','Challenge','','','Portuguese','','')",
    "('2178947891','Name','','','Portuguese','','')"
  ],
  [ "('1877844784','City','','','English','','')" ]
];
 
$resultado = [];
for($a = 0; $a < count($dados); $a++) {
  $sql = "INSERT INTO 'tabela' VALUES ";
  for($b = 0; $b < count($dados[$a]); $b++) {
    if ($b > 0) { $sql .= ', '; } // Concatena vírgula
    $sql .= $dados[$a][$b]; // Concatena valor
    if ($b === (count($dados[$a]) -1 )) {
      $sql .= ";"; // Concatena ponto e vírgula
    }
  }
  array_push($resultado, $sql);
}
 
echo implode("\n", $resultado);

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