Auth: Add page to change password.

Configure launcher as a default return to address.

Use standard X-Forwarded-User instead of custom X-User header.
Add X-Forwarded-UserId header holding user unique identificator.

Change-Id: Ib2e6329ba9fb91d2cc9a86b0c5fc78898769e3b8
diff --git a/core/auth/ui/static/main.css b/core/auth/ui/static/main.css
index 454eb2d..a261094 100644
--- a/core/auth/ui/static/main.css
+++ b/core/auth/ui/static/main.css
@@ -83,3 +83,7 @@
 label {
   color: white;
 }
+
+.error-message {
+  color: var(--pico-primary-hover);
+}