Fix activity locale (#2709)

Author: ethantkoenig

options/locale/locale_en-US.ini

@@ -840,7 +840,7 @@ activity.new_issues_count_n = New Issues
 activity.new_issue_label = Opened
 activity.title.unresolved_conv_1 = %d Unresolved conversation
 activity.title.unresolved_conv_n = %d Unresolved conversations
-activity.unresolved_conv_desc = List of all old issues and pull requests that have changed recently but has not been resloved yet.
+activity.unresolved_conv_desc = List of all old issues and pull requests that have changed recently but have not been resolved yet.
 activity.unresolved_conv_label = Open
 activity.title.releases_1 = %d Release
 activity.title.releases_n = %d Releases