Add xlf as xml highlighting (#1159)

* Add xlf as xml highlighting

* Add xlf as xml highlighting

Author: frankdekker

src/Service/CodeHighlight/FilenameToLanguageTranslator.php

@@ -15,23 +15,23 @@ public function translate(string $filename): ?string
         $filename = (string)preg_replace('/\.(example|dist|local)$/', '', $filename);
 
         return match (strtolower(pathinfo($filename, PATHINFO_EXTENSION))) {
-            "css"           => "css",
-            "env", "ini"    => "ini",
-            "js"            => "javascript",
-            "json", "json5" => "json",
-            "htaccess"      => "apache",
-            "less"          => "less",
-            "md"            => "markdown",
-            "php"           => "php",
-            "py"            => "python",
-            "scss", "sass"  => "scss",
-            "sh"            => "bash",
-            "sql"           => "sql",
-            "ts"            => "typescript",
-            "twig"          => "twig",
-            "xml", "html"   => "xml",
-            "yaml", "yml"   => "yaml",
-            default         => null,
+            "css"                => "css",
+            "env", "ini"         => "ini",
+            "js"                 => "javascript",
+            "json", "json5"      => "json",
+            "htaccess"           => "apache",
+            "less"               => "less",
+            "md"                 => "markdown",
+            "php"                => "php",
+            "py"                 => "python",
+            "scss", "sass"       => "scss",
+            "sh"                 => "bash",
+            "sql"                => "sql",
+            "ts"                 => "typescript",
+            "twig"               => "twig",
+            "xml", "html", "xlf" => "xml",
+            "yaml", "yml"        => "yaml",
+            default              => null,
         };
     }
 }

tests/Unit/Service/CodeHighlight/FilenameToLanguageTranslatorTest.php

@@ -48,6 +48,7 @@ public static function dataProvider(): array
             "xml.dist"    => ["/path/to/file.xml.dist", "xml"],
             "xml.local"   => ["/path/to/file.xml.local", "xml"],
             "xml.example" => ["/path/to/file.xml.example", "xml"],
+            "xlf"         => ["/path/to/file.xlf", "xml"],
             "yaml"        => ["/path/to/file.yaml", "yaml"],
             "yml"         => ["/path/to/file.yml", "yaml"],
             "foobar"      => ["/path/to/file.foobar", null]