Use relevant title for unlike study button

app/views/study/jsI18n.scala

@@ -35,6 +35,7 @@ object jsI18n {
       youAreNowASpectator,
       pgnTags,
       like,
+      unlike,
       newTag,
       commentThisPosition,
       commentThisMove,

modules/i18n/src/main/I18nKeys.scala

@@ -1067,6 +1067,7 @@ val `youAreNowAContributor` = new I18nKey("study:youAreNowAContributor")
 val `youAreNowASpectator` = new I18nKey("study:youAreNowASpectator")
 val `pgnTags` = new I18nKey("study:pgnTags")
 val `like` = new I18nKey("study:like")
+val `unlike` = new I18nKey("study:unlike")
 val `newTag` = new I18nKey("study:newTag")
 val `commentThisPosition` = new I18nKey("study:commentThisPosition")
 val `commentThisMove` = new I18nKey("study:commentThisMove")

translation/source/study.xml

@@ -41,6 +41,7 @@
   <string name="youAreNowASpectator">You are now a spectator</string>
   <string name="pgnTags">PGN tags</string>
   <string name="like">Like</string>
+  <string name="unlike">Unlike</string>
   <string name="newTag">New tag</string>
   <string name="commentThisPosition">Comment on this position</string>
   <string name="commentThisMove">Comment on this move</string>

ui/analyse/src/study/studyView.ts

@@ -151,7 +151,7 @@ function metadata(ctrl: StudyCtrl): VNode {
           class: { liked: d.liked },
           attrs: {
             'data-icon': d.liked ? '' : '',
-            title: ctrl.trans.noarg('like'),
+            title: ctrl.trans.noarg(d.liked ? 'unlike' : 'like'),
           },
           hook: bind('click', ctrl.toggleLike),
         },