Rename ‘File a Bug’ to ‘Report an Issue’

This makes it more consistent with ‘Report an issue’ under View > Debug Log.

Not using ellipsis as menu item doesn’t require user confirmation:
https://stackoverflow.com/a/637708

test/app/fixtures/menu-mac-os-setup.json

@@ -172,7 +172,7 @@
         "click": null
       },
       {
-        "label": "File a Bug",
+        "label": "Report an Issue",
         "click": null
       }
     ]

test/app/fixtures/menu-mac-os.json

@@ -159,7 +159,7 @@
         "click": null
       },
       {
-        "label": "File a Bug",
+        "label": "Report an Issue",
         "click": null
       }
     ]

test/app/fixtures/menu-windows-linux-setup.json

@@ -119,7 +119,7 @@
         "click": null
       },
       {
-        "label": "File a Bug",
+        "label": "Report an Issue",
         "click": null
       },
       {

test/app/fixtures/menu-windows-linux.json

@@ -108,7 +108,7 @@
         "click": null
       },
       {
-        "label": "File a Bug",
+        "label": "Report an Issue",
         "click": null
       },
       {