fix: make exeption messages more readable

application/source/i18n/translations.mjs

@@ -190,10 +190,12 @@ class Translations extends Base {
 /**
  * Returns the translations for the current document.
  *
- * @param element
- * @returns {*}
- * @throws {Error} Element is not an HTMLElement
- * @throws {Error} Missing translations
+ * @param {HTMLElement|undefined} [element] - Element to search for translations. Default: element with objectlink @schukai/monster/i18n/translations@@link.
+ * @returns {Translations}
+ * @throws {Error} Element is not an HTMLElement.
+ * @throws {Error} Cannot find element with translations. Add a translations object to the document.
+ * @throws {Error} This element has no translations.
+ * @throws {Error} Missing translations.
  */
 function getDocumentTranslations(element) {
 
@@ -201,14 +203,17 @@ function getDocumentTranslations(element) {
 
     if (!(element instanceof HTMLElement)) {
         element = d.querySelector('['+ATTRIBUTE_OBJECTLINK+'~="' + translationsLinkSymbol.toString() + '"]');
+        if (element === null) {
+            throw new Error("Cannot find element with translations. Add a translations object to the document.");
+        }
     }
 
     if (!(element instanceof HTMLElement)) {
-        throw new Error("Element is not an HTMLElement");
+        throw new Error("Element is not an HTMLElement.");
     }
 
     if (!hasObjectLink(element, translationsLinkSymbol)) {
-        throw new Error("Missing translations");
+        throw new Error("This element has no translations.");
     }
     
     let obj = getLinkedObjects(element, translationsLinkSymbol);
@@ -219,7 +224,7 @@ function getDocumentTranslations(element) {
         }
     }
 
-    throw new Error("Missing translations");
+    throw new Error("Missing translations.");
 
 }