supybot-plugin-create: Remove fallback for missing supybot.i18n

It is unlikely new plugins will be used on stock Supybot or Gribble.

scripts/supybot-plugin-create

@@ -92,13 +92,10 @@ pluginTemplate = '''
 
 from supybot import utils, plugins, ircutils, callbacks
 from supybot.commands import *
-try:
-    from supybot.i18n import PluginInternationalization
-    _ = PluginInternationalization('%s')
-except ImportError:
-    # Placeholder that allows to run the plugin on a bot
-    # without the i18n module
-    _ = lambda x: x
+from supybot.i18n import PluginInternationalization
+
+
+_ = PluginInternationalization('%s')
 
 
 class %s(callbacks.Plugin):