Another go

core/Metrics.php

@@ -288,10 +288,9 @@ class Piwik_Metrics
         return array_map('Piwik_Translate', $documentation);
     }
 
-
     public static function getPercentVisitColumn()
     {
-        $percentVisitsLabel = str_replace(' ', ' ' /* non breaking space */, Piwik_Translate('General_ColumnPercentageVisits'));
+        $percentVisitsLabel = str_replace(' ', html_entity_decode(' '), Piwik_Translate('General_ColumnPercentageVisits'));
         return $percentVisitsLabel;
     }
 

plugins/UserSettings/UserSettings.php

@@ -208,7 +208,7 @@ class Piwik_UserSettings extends Piwik_Plugin
             if ($apiAction == 'getPlugin') {
                 $report['metrics'] = array(
                     'nb_visits',
-                    'nb_visits_percentage' => Piwik_Metrics::getPercentVisitColumn()
+                    'nb_visits_percentage' => Piwik_Translate('General_ColumnPercentageVisits')
                 );
                 // There is no processedMetrics for this report
                 $report['processedMetrics'] = array();

plugins/VisitorInterest/API.php

@@ -117,8 +117,7 @@ class Piwik_VisitorInterest_API
             }
         } else {
             $totalVisits = array_sum($dataTable->getColumn(Piwik_Metrics::INDEX_NB_VISITS));
-            $dataTable->queueFilter('ColumnCallbackAddColumnPercentage', array(
-                                                                              'nb_visits_percentage', 'nb_visits', $totalVisits));
+            $dataTable->queueFilter('ColumnCallbackAddColumnPercentage', array('nb_visits_percentage', 'nb_visits', $totalVisits));
         }
     }
 }

tests/PHPUnit/Integration/expected/test_apiGetReportMetadata__API.getReportMetadata_day.xml

@@ -1808,7 +1808,7 @@
 		<documentation>This report shows which browser plugins your visitors had enabled. This information might be important for choosing the right way to deliver your content.</documentation>
 		<metrics>
 			<nb_visits>Visits</nb_visits>
-			<nb_visits_percentage>% Visits</nb_visits_percentage>
+			<nb_visits_percentage>% Visits</nb_visits_percentage>
 		</metrics>
 		<constantRowsCount>1</constantRowsCount>
 		<metricsDocumentation>