Add pointers to existing administration doc

wiki/src/blueprint/translation_platform.mdwn

@@ -431,6 +431,17 @@ Currently implemented proposal
     suggestion to be accepted as a validated translation?
     (At the moment, suggestion voting is disabled.)
 
+Weblate administration
+======================
+
+- [[Enabling a new language|contribute/l10n_tricks#weblate-administration]]
+  Make sure to enable languages only if they are part of our tier-1
+  list or discuss the matter on the l10n-mailing list.
+
+- Sysadmin: This documentation currently still lives in
+  translate-server.git and should be moved somewhere else.
+  [[!tails_ticket 15086]]
+
 Weblate installation and maintenance
 ====================================