hgweb, i18n: do not translate search mode description

The search mode description can't be translated by itself, since
it's displayed as part of a template phrase (the "Assuming ..."
/ "Use ... instead" bits). Just drop the translation markers for
now, since the templates themselves currently do not support
translations.

mercurial/hgweb/webcommands.py

@@ -151,9 +151,9 b' def _search(web, req, tmpl):'
             yield web.repo[r]
 
     searchfuncs = {
-        MODE_REVISION: (revsearch, _('exact revision search')),
-        MODE_KEYWORD: (keywordsearch, _('literal keyword search')),
-        MODE_REVSET: (revsetsearch, _('revset expression search')),
+        MODE_REVISION: (revsearch, 'exact revision search'),
+        MODE_KEYWORD: (keywordsearch, 'literal keyword search'),
+        MODE_REVSET: (revsetsearch, 'revset expression search'),
     }
 
     def getsearchmode(query):