Remove lingering code about custom metrics (deprecated and removed)

server/sonar-web/src/main/js/app/utils/startReactApp.tsx

@@ -125,7 +125,6 @@ function renderRedirects() {
       <Redirect from="/governance" to="/portfolio" />
       <Redirect from="/groups" to="/admin/groups" />
       <Redirect from="/extension/governance/portfolios" to="/portfolios" />
-      <Redirect from="/metrics" to="/admin/custom_metrics" />
       <Redirect from="/permission_templates" to="/admin/permission_templates" />
       <Redirect from="/profiles/index" to="/profiles" />
       <Redirect from="/projects_admin" to="/admin/projects_management" />

sonar-core/src/main/resources/org/sonar/l10n/core.properties

@@ -3992,20 +3992,6 @@ encryption.how_to_use.content2=Restrict access to this file by making it readabl
 encryption.how_to_use.content3=Restart the server if the property {property} has been set or changed.
 encryption.how_to_use.content4=For each property that you want to encrypt, generate the encrypted value and replace the original value wherever it is stored (configuration files, command lines).
 
-#------------------------------------------------------------------------------
-#
-# CUSTOM METRICS
-#
-#------------------------------------------------------------------------------
-custom_metrics.page=Custom Metrics
-custom_metrics.deprecated=Custom metrics are deprecated and will be removed soon.
-custom_metrics.page.description=These metrics are available for all projects. Manual measures can be set at project level via the configuration interface.
-custom_metrics.delete_metric=Delete Metric
-custom_metrics.delete_metric.confirmation=Are you sure you want to delete metric "{0}"?
-custom_metrics.update_metric=Update Metric
-custom_metrics.create_metric=Create Metric
-custom_metrics.domain=Domain
-
 
 #------------------------------------------------------------------------------
 #