Revert dialog: Change "Original issue" to "Original change"

Change-Id: I406dc5a441a863b5aa948a4b2078a3c212ba798a

polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog.js

diff --git a/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog.js b/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog.js
index 2eb6646..b01c6be 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog.js
+++ b/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog.js
@@ -47,7 +47,7 @@
       this.message = revertTitle + '\n\n' +
                      revertCommitText + '\n\n' +
                      'Reason for revert: <INSERT REASONING HERE>\n\n' +
-                     'Original issue\'s description:\n' + originalCommitText;
+                     'Original change\'s description:\n' + originalCommitText;
     },
 
     _handleConfirmTap: function(e) {

polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_test.html

diff --git a/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_test.html b/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_test.html
index 521aeef..3e5f0a2 100644
--- a/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_test.html
+++ b/polygerrit-ui/app/elements/change/gr-confirm-revert-dialog/gr-confirm-revert-dialog_test.html
@@ -44,7 +44,7 @@
       var expected = 'Revert "one line commit"\n\n' +
                      'This reverts commit abcdefg.\n\n' +
                      'Reason for revert: <INSERT REASONING HERE>\n\n' +
-                     'Original issue\'s description:\n' +
+                     'Original change\'s description:\n' +
                      '> one line commit\n> \n' +
                      '> Change-Id: abcdefg\n> ';
       assert.equal(element.message, expected);
@@ -57,7 +57,7 @@
       var expected = 'Revert "many lines"\n\n' +
                      'This reverts commit abcdefg.\n\n' +
                      'Reason for revert: <INSERT REASONING HERE>\n\n' +
-                     'Original issue\'s description:\n' +
+                     'Original change\'s description:\n' +
                      '> many lines\n> commit\n> \n> message\n> \n' +
                      '> Change-Id: abcdefg\n> ';
       assert.equal(element.message, expected);
@@ -70,7 +70,7 @@
       var expected = 'Revert "Revert "one line commit""\n\n' +
                      'This reverts commit abcdefg.\n\n' +
                      'Reason for revert: <INSERT REASONING HERE>\n\n' +
-                     'Original issue\'s description:\n' +
+                     'Original change\'s description:\n' +
                      '> Revert "one line commit"\n> \n' +
                      '> Change-Id: abcdefg\n> ';
       assert.equal(element.message, expected);