Use php-translation symfony bundle.

This gives us some advanced translation extractors (from form labels, flashes, etc.) and provide some more debug tools.

config/bundles.php

@@ -21,4 +21,5 @@ return [
     Twig\Extra\TwigExtraBundle\TwigExtraBundle::class => ['all' => true],
     Gregwar\CaptchaBundle\GregwarCaptchaBundle::class => ['all' => true],
     Doctrine\Bundle\DoctrineCacheBundle\DoctrineCacheBundle::class => ['all' => true],
+    Translation\Bundle\TranslationBundle::class => ['all' => true],
 ];

config/packages/dev/php_translation.yaml

@@ -0,0 +1,5 @@
+translation:
+    symfony_profiler:
+        enabled: true
+    webui:
+        enabled: true

config/packages/php_translation.yaml

@@ -0,0 +1,11 @@
+translation:
+    locales: ["en", "de"]
+    edit_in_place:
+        enabled: false
+        config_name: app
+    configs:
+        app:
+            dirs: ["%kernel.project_dir%/templates", "%kernel.project_dir%/src"]
+            output_dir: "%kernel.project_dir%/translations"
+            excluded_names: ["*TestCase.php", "*Test.php"]
+            excluded_dirs: [cache, data, logs]

config/routes/dev/php_translation.yaml

@@ -0,0 +1,6 @@
+_translation_webui:
+    resource: "@TranslationBundle/Resources/config/routing_webui.yml"
+    prefix:  /admin
+  
+_translation_profiler:
+    resource: '@TranslationBundle/Resources/config/routing_symfony_profiler.yml'

config/routes/php_translation.yaml

@@ -0,0 +1,3 @@
+_translation_edit_in_place:
+    resource: '@TranslationBundle/Resources/config/routing_edit_in_place.yml'
+    prefix:  /admin