[PATCH 2 of 2] templatekw: specify plural form of instability

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1502601148 -32400
#      Sun Aug 13 14:12:28 2017 +0900
# Node ID 50723ff5912ecde3f8e43bea4b84db03bae7f1f0
# Parent  6cd0eafbd52b4e0efcad037876dc9bdf6c9bbfbb
templatekw: specify plural form of instability

Follows up 40739aef97f7.

diff --git a/mercurial/templatekw.py b/mercurial/templatekw.py
--- a/mercurial/templatekw.py
+++ b/mercurial/templatekw.py
@@ -783,7 +783,8 @@ def showinstabilities(**args):
     (EXPERIMENTAL)
     """
     args = pycompat.byteskwargs(args)
-    return showlist('instability', args['ctx'].instabilities(), args)
+    return showlist('instability', args['ctx'].instabilities(), args,
+                    plural='instabilities')
 
 # tell hggettext to extract docstrings from these functions:
 i18nfunctions = keywords.values()