Make branding configurable (#173)

* Remove orphan function

* Add centralized branding helpers and update locales

* Remove _plus and add (proper) brand

* No longer Sure, configurable

* Consistency with compose file naming

* Missed `product_name` mapping

* Fix brand/product name in mailers

* Product name in email reset flow

* Fix i18n errors/tests

* Fix password mailer brand/product name (again)

* Missed hardcoded `Sure` in onboarding goals

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Signed-off-by: Juan José Mata <jjmata@jjmata.com>

* PR nitpick on documentation

* Missing interpolation key for invited UI

* Orphan assets

* New logos

---------

Signed-off-by: Juan José Mata <jjmata@jjmata.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

config/locales/views/subscriptions/en.yml

@@ -1,3 +1,3 @@
 en:
   subscriptions:
-    self_hosted_alert: "Sure+ is not available in self-hosted mode."
+    self_hosted_alert: "%{product_name} is not available in self-hosted mode."

config/locales/views/subscriptions/nb.yml

@@ -1,4 +1,4 @@
----
-nb:
-  subscriptions:
-    self_hosted_alert: "Sure+ er ikke tilgjengelig i selvhostet modus."
+---
+nb:
+  subscriptions:
+    self_hosted_alert: "%{product_name} er ikke tilgjengelig i selvhostet modus."

config/locales/views/subscriptions/tr.yml

@@ -1,4 +1,4 @@
 ---
 tr:
   subscriptions:
-    self_hosted_alert: "Sure+ kendi sunucunda barındırılan modda kullanılamaz."
+    self_hosted_alert: "%{product_name} kendi sunucunda barındırılan modda kullanılamaz."