fix: replace ugettext with gettext (#33022)

openedx/core/djangoapps/dark_lang/templates/dark_lang/preview-language-fragment.html

@@ -5,7 +5,7 @@
 <%namespace name='static' file='../static_content.html'/>
 
 <%!
-from django.utils.translation import ugettext as _
+from django.utils.translation import gettext as _
 %>
 
 <%block name="content">

openedx/core/lib/license/templates/license.html

@@ -1,7 +1,7 @@
 <%page args="license, button=False, button_size='88x31'" expression_filter="h"/>
 ## keep this synchronized with the contents of cms/templates/js/license-selector.underscore
 <%!
-from django.utils.translation import ugettext as _
+from django.utils.translation import gettext as _
 
 def parse_license(lic):
     """