Update system config, theme blueprint and langswitcher config

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

user/config/plugins/langswitcher.yaml

@@ -0,0 +1,5 @@
+enabled: true
+built_in_css: true
+translated_urls: true
+untranslated_pages_behavior: none
+language_display: short

user/config/system.yaml

@@ -168,7 +168,7 @@ debugger:
   shutdown:
     close_connection: true
 images:
-  adapter: gd
+  adapter: imagick
   default_image_quality: 85
   cache_all: false
   cache_perms: '0755'

user/themes/natascha/blueprints.yaml

@@ -1,4 +1,4 @@
-name: Natascha
+name: Natascha's Theme
 version: 1.0.0
 description: Custom theme for Natascha Rieter art gallery website
 type: theme