Fix uncaught parameter missing exceptions and missing error templates (#11702)

app/views/errors/400.html.haml

@@ -0,0 +1,5 @@
+- content_for :page_title do
+  = t('errors.400')
+
+- content_for :content do
+  = t('errors.400')

app/views/errors/406.html.haml

@@ -0,0 +1,5 @@
+- content_for :page_title do
+  = t('errors.406')
+
+- content_for :content do
+  = t('errors.406')

app/views/errors/503.html.haml

@@ -0,0 +1,5 @@
+- content_for :page_title do
+  = t('errors.503')
+
+- content_for :content do
+  = t('errors.503')