Update nginx configuration for cache settings and new locales

* Consolidates add_header statements into single top-level section
* Updates locales to match frontend/src/app/app.constants.ts
* Re-orders locales to match locale selector for easier checking

nginx.conf

@@ -93,6 +93,7 @@ http {
 	        ~*^nb nb;
 	        ~*^pl pl;
 	        ~*^pt pt;
+	        ~*^ru ru;
 	        ~*^sl sl;
 	        ~*^fi fi;
 	        ~*^sv sv;
@@ -100,7 +101,7 @@ http {
 	        ~*^uk uk;
 	        ~*^vi vi;
 	        ~*^zh zh;
-	        ~*^ru ru;
+	        ~*^hi hi;
 	}
 
 	map $cookie_lang $lang {
@@ -123,6 +124,7 @@ http {
 	        ~*^nb nb;
 	        ~*^pl pl;
 	        ~*^pt pt;
+	        ~*^ru ru;
 	        ~*^sl sl;
 	        ~*^fi fi;
 	        ~*^sv sv;
@@ -130,7 +132,7 @@ http {
 	        ~*^uk uk;
 	        ~*^vi vi;
 	        ~*^zh zh;
-	        ~*^ru ru;
+	        ~*^hi hi;
 	}
 
 	server {