translate background nudge title

data/core.yaml

@@ -813,6 +813,11 @@ en:
     fix_misalignment: Imagery Offset
     offset: "Drag anywhere in the gray area below to adjust the imagery offset, or enter the offset values in meters."
     offset_label: "Adjust Imagery Offset"
+    nudge:
+      top: "nudge top"
+      left: "nudge left"
+      right: "nudge right"
+      bottom: "nudge bottom"
   map_data:
     title: Map Data
     description: Map Data

modules/ui/sections/background_offset.js

@@ -156,7 +156,7 @@ export function uiSectionBackgroundOffset(context) {
             .selectAll('button')
             .data(_directions).enter()
             .append('button')
-            .attr('title', function(d) { return 'nudge ' + d[0]; })
+            .attr('title', function(d) { return t(`background.nudge.${d[0]}`); })
             .attr('class', function(d) { return d[0] + ' nudge'; })
             .on('click', function(d3_event, d) {
                 nudge(d[1]);