fix(ranking): harmonize validation error wording

Signed-off-by: paul bochtler <65470117+datapumpernickel@users.noreply.github.com>

Author: datapumpernickel

src/components/Questions/QuestionRanking.vue

@@ -271,7 +271,7 @@ export default {
 			).length
 
 			if (this.isRequired && this.rankedOptions.length === 0) {
-				this.errorMessage = t('forms', 'You must choose at least one option')
+				this.errorMessage = t('forms', 'You must rank all options')
 				return false
 			}