Update ru translation for 1.5.1.1

Signed-off-by: Alex Ivanov <ai@contributor.pw>
Change-Id: Iccc084c751bab1e23774e88215141717f7dd3fb1
diff --git a/docs/op_indicator.md b/docs/op_indicator.md
index 8d4cec3..e45742f 100644
--- a/docs/op_indicator.md
+++ b/docs/op_indicator.md
@@ -1,4 +1,4 @@
-[En español](op_indicator.es.md)
+[En español](op_indicator.es.md) • [Русский](op_indicator.ru.md)
 
 # OP indicator
 This is a feature which shows an indicator in threads next to the OP's username,