web-i18n: Update frontend translated strings for stream rename channel.

Updates translated strings in web/ that do not need updates to any
tests. The majority of these strings are also unique to the file/
template that they are in. A few have overlap with one other file.

Some changes here update placeholders/variables in these strings to
no longer use stream so that all the translation updates for this
rename happen at the same time.

The exception to this are cases of "<z-stream>" placeholders in
these translated strings.

Part of the stream to channel rename project.

web/src/compose_notifications.ts

@@ -69,7 +69,7 @@ export function notify_automatic_new_visibility_policy(
             banner_type: compose_banner.SUCCESS,
             classname: compose_banner.CLASSNAMES.automatic_new_visibility_policy,
             link_msg_id: data.id,
-            stream_topic,
+            channel_topic: stream_topic,
             narrow_url,
             followed,
             button_text: $t({defaultMessage: "Change setting"}),