settings: Add UI for realm-level default of enter_sends settings.

static/js/settings_config.ts

@@ -411,6 +411,7 @@ export const realm_user_settings_defaults_labels = {
     }),
 
     realm_presence_enabled: $t({defaultMessage: "Display availability to other users when online"}),
+    realm_enter_sends: $t({defaultMessage: "Enter sends when composing a message"}),
 };
 
 // NOTIFICATIONS

static/js/settings_realm_user_settings_defaults.js

@@ -36,5 +36,18 @@ export function set_up() {
         );
     });
 
+    container.find(".enter_sends").on("change", (e) => {
+        e.preventDefault();
+        e.stopPropagation();
+
+        const data = {enter_sends: container.find(".enter_sends").prop("checked")};
+        settings_ui.do_settings_change(
+            channel.patch,
+            "/json/realm/user_settings_defaults",
+            data,
+            container.find(".other-setting-status").expectOne(),
+        );
+    });
+
     maybe_disable_widgets();
 }

static/templates/settings/organization_user_settings_defaults.hbs

@@ -16,4 +16,14 @@
           help_link="/help/status-and-availability"
           prefix="realm_"}}
     </div>
+
+    <div class="form-horizontal" class="other_settings">
+        <h3 class="inline-block">{{t "Other settings" }}</h3>
+        <div class="alert-notification other-setting-status"></div>
+        {{> settings_checkbox
+          setting_name="enter_sends"
+          is_checked=settings_object.enter_sends
+          label=settings_label.realm_enter_sends
+          prefix="realm_"}}
+    </div>
 </div>

tools/lib/capitalization.py

@@ -118,6 +118,7 @@ IGNORED_PHRASES = [
     # SPECIAL CASES
     # Enter is usually capitalized
     r"Press Enter to send",
+    r"Send message on pressing Enter",
     # Because topics usually are lower-case, this would look weird if it were capitalized
     r"more topics",
     # For consistency with "more topics"