preparing for more streamlined backend translation

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

core/src/main/java/de/srsoftware/umbrella/core/model/Translatable.java

@@ -0,0 +1,38 @@
+package de.srsoftware.umbrella.core.model;
+
+import de.srsoftware.umbrella.core.ModuleRegistry;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class Translatable {
+	private final String message;
+	private Map<String, Object> fills;
+	private final HashMap<String,String> translated = new HashMap<>();
+
+	public Translatable(String message, Map<String,Object> fills){
+		this.fills   = fills;
+		this.message = message;
+	}
+
+	public String translate(String language){
+		var translation = translated.get(language);
+		if (translation == null){
+			var translatedFills = new HashMap<String,String>();
+			if (fills != null) {
+				for (var entry : fills.entrySet()) {
+					var o = entry.getValue();
+					var val = switch (o) {
+						case Translatable tr -> tr.translate(language);
+						case String s -> s;
+						default -> o.toString();
+					};
+					translatedFills.put(entry.getKey(), val);
+				}
+			}
+			translation = ModuleRegistry.translator().translate(language,message,translatedFills);
+			translated.put(language,translation);
+		}
+		return translation;
+	}
+}