Updates to filter field labels to make more consistent.

https://jira.secondlife.com/browse/EXT-2307

indra/newview/skins/default/xui/en/floater_texture_ctrl.xml

@@ -101,7 +101,7 @@
     <filter_editor
      follows="left|top|right"
      height="23"
-     label="Filter textures"
+     label="Filter Textures"
      layout="topleft"
      left="175"
      name="inventory search editor"

indra/newview/skins/default/xui/en/panel_main_inventory.xml

@@ -17,7 +17,7 @@
      text_pad_left="14"
      follows="left|top|right"
 	height="23"
-     label="Filter"
+     label="Filter Inventory"
      layout="topleft"
      left="15"
 max_length="300"

indra/newview/skins/default/xui/en/panel_places.xml

@@ -22,7 +22,7 @@ background_visible="true"
      height="23"
      layout="topleft"
      left="15"
-     label="Filter"
+     label="Filter Places"
      max_length="300"
      name="Filter"
      top="3"