Made the label of AddButton customizable

Author: smrsan76

src/AddButton/AddButton.tsx

@@ -7,7 +7,7 @@ import AddIcon from '@material-ui/icons/Add';
 
 const AddButton: React.FC<AddButtonProps> = props => (
   <Button {...props} color="secondary">
-    <AddIcon /> Add Item
+    <AddIcon /> {props.label || 'Add Item'}
   </Button>
 );
 

src/ArrayFieldTemplate/ArrayFieldTemplate.tsx

@@ -152,6 +152,7 @@ const DefaultFixedArrayFieldTemplate = (props: ArrayFieldTemplateProps) => {
           className="array-item-add"
           onClick={props.onAddClick}
           disabled={props.disabled || props.readonly}
+          label={props.uiSchema.buttonLabel}
         />
       )}
     </fieldset>
@@ -192,6 +193,7 @@ const DefaultNormalArrayFieldTemplate = (props: ArrayFieldTemplateProps) => {
                     className="array-item-add"
                     onClick={props.onAddClick}
                     disabled={props.disabled || props.readonly}
+                    label={props.uiSchema.buttonLabel}
                   />
                 </Box>
               </Grid>