Consolidate local overrides of messages and styles in "local" subdirectory. Allows customisation without creating a new thmee.

webapp/src/main/webapp/themes/tenderfoot/css/screen.css

@@ -31,3 +31,4 @@ VIVO tenderfoot theme: screen styles
 @import url("page-login.css");
 @import url("page-menu.css");
 @import url("https://fonts.googleapis.com/css?family=Noto+Sans");
+@import url("../../../local/css/local.css");

webapp/src/main/webapp/themes/wilma/css/screen.css

@@ -24,3 +24,4 @@ VIVO wilma theme: screen styles
 
 @import url("reset.css");
 @import url("wilma.css");
+@import url("../../../local/css/local.css");