Don't add encondings in i18n functions

This code was unnecessary as normalise_locale adds the default encoding automatically. As normalise_locale doesn't work with locale names like en.UTF-8 (produced by this code fragments), it's better to just use en as locale name. normalise_locale would change en to en_US.UTF-8 then.

calendarweek/django.py

@@ -14,7 +14,7 @@ def i18n_day_names(loc: Optional[str] = None) -> Tuple[str]:
     """ Return a tuple of day names for the current locale. """
 
     if loc is None:
-        loc = to_locale(get_language()) + "." + DEFAULT_LOCALE_ENCODING
+        loc = to_locale(get_language())
 
     try:
         return CalendarWeek.day_names(loc)
@@ -26,7 +26,7 @@ def i18n_day_abbrs(loc: Optional[str] = None) -> Tuple[str]:
     """ Return a tuple of day name abbreviations for the current locale. """
 
     if loc is None:
-        loc = to_locale(get_language()) + "." + DEFAULT_LOCALE_ENCODING
+        loc = to_locale(get_language())
 
     try:
         return CalendarWeek.day_abbrs(loc)
@@ -38,7 +38,7 @@ def i18n_month_names(loc: Optional[str] = None) -> Tuple[str]:
     """ Return a tuple of month names for the current locale. """
 
     if loc is None:
-        loc = to_locale(get_language()) + "." + DEFAULT_LOCALE_ENCODING
+        loc = to_locale(get_language())
 
     try:
         return CalendarWeek.month_names(loc)
@@ -50,7 +50,7 @@ def i18n_month_abbrs(loc: Optional[str] = None) -> Tuple[str]:
     """ Return a tuple of month name abbreviations for the current locale. """
 
     if loc is None:
-        loc = to_locale(get_language()) + "." + DEFAULT_LOCALE_ENCODING
+        loc = to_locale(get_language())
 
     try:
         return CalendarWeek.month_abbrs(loc)