Clarify what suggestions are used for.

wiki/src/blueprint/translation_platform.mdwn

@@ -162,6 +162,9 @@ Access control
   translators sufficient access rights so that they can do their job,
   even without anyone at Tails personally knowing any of them.
 
+- Suggested translations are used to build the [[staging
+  website|translation_platform#staging-website]].
+
 ### Currently implemented proposal
 
 - In Weblate lingo, we use the [dedicated