rename grid to network (for consistency) and activity to stream (as seen in osada) because it makes much more sense.

(cherry picked from commit 96277372d5)

Zotlabs/Module/Settings/Network.php

@@ -55,7 +55,7 @@ class Network {
 			'$rpath' => $rpath,
 			'$action_url' => 'settings/' . $module,
 			'$form_security_token' => get_form_security_token('settings_' . $module),
-			'$title' => t('Activity Settings'),
+			'$title' => t('Stream Settings'),
 			'$features' => process_module_features_get(local_channel(), $features),
 			'$extra_settings_html' => $extra_settings_html,
 			'$submit' => t('Submit')