Auto stash before cherry pick of "Merge pull request #1843 from cisagov/nl/1798-update-email-signature"

First pass of searching remaining instances of "application"

docs/architecture/diagrams/get.gov registrar deployment.puml

@@ -18,13 +18,13 @@ Deployment_Node(aws, "AWS GovCloud", "Amazon Web Services Region") {
             Deployment_Node(organization, "get.gov organization") {
                 Deployment_Node(sandbox, "sandbox space") {
                     System_Boundary(dashboard_sandbox, "get.gov registrar") {
-                        Container(getgov_app_sandbox, "Registrar Application", "Python, Django", "Delivers static HTML/CSS and forms")
+                        Container(getgov_app_sandbox, "Registrar Domain Request", "Python, Django", "Delivers static HTML/CSS and forms")
                         ContainerDb(dashboard_db_sandbox, "sandbox PostgreSQL Database", "AWS RDS", "Stores agency information and reports")
                     }
                 }
                 Deployment_Node(stable, "stable space") {
                     System_Boundary(dashboard_stable, "get.gov registrar") {
-                        Container(getgov_app_stable, "Registrar Application", "Python, Django", "Delivers static HTML/CSS and forms")
+                        Container(getgov_app_stable, "Registrar Domain Request", "Python, Django", "Delivers static HTML/CSS and forms")
                         ContainerDb(dashboard_db_stable, "stable PostgreSQL Database", "AWS RDS", "Stores agency information and reports")
                     }
                 }

docs/architecture/diagrams/model_timeline.md

@@ -37,7 +37,7 @@ allowmixing
 left to right direction
 
 class DomainRequest {
-  Application for a domain
+  Request for a domain
   --
   creator (User)
   investigator (User)