pkp/pkp-lib#5885 updated and added new UI component (#333)

* pkp/pkp-lib#5885 updated and added new UI component

* pkp/pkp-lib#5885 fixed issue with value updating in db

* pkp/pkp-lib#5885 removed unnecessary fields and controls with field range component enhancement

* pkp/pkp-lib#5885 updated using new slider component

* pkp/pkp-lib#5885 fixed merged conflict

src/components/Form/fields/FieldSlider.vue

@@ -163,7 +163,12 @@ export default {
 	},
 	computed: {
 		displayedValue() {
-			if (this.valueLabelMin && this.currentValue == this.min) {
+			if (
+				this.valueLabelMin &&
+				(this.currentValue == this.min ||
+					this.currentValue == null ||
+					this.currentValue == undefined)
+			) {
 				return this.replaceLocaleParams(this.valueLabelMin, {
 					value: this.currentValue,
 				});