Pontoon/AMO Frontend: Update Slovak (sk)

Co-authored-by: wladow <[email protected]> (sk)

Author: mozilla-pontoon

locale/sk/LC_MESSAGES/amo.po

@@ -1682,7 +1682,7 @@ msgstr "Požadované oprávnenia:"
 
 #: src/amo/components/PermissionsCard/index.js:94
 msgid "Optional permissions:"
-msgstr ""
+msgstr "Voliteľné povolenia:"
 
 #: src/amo/components/PermissionsCard/permissions.js:27
 msgid "Read and modify bookmarks"