Removed old PHP code, migrated to Python and Flask

Update .dockerignore, .env, and 503 more files...

data/strings/en/test.json

@@ -0,0 +1,7 @@
+{
+	"test.header.title": "Test Page",
+	"test.controls": "Debugging options",
+	"test.controls.borders": "Show/Hide borders",
+	"test.app.card.demo": "Application card",
+	"test.content.card.demo": "Content card"
+}