Fix incorrect i18n usage for some strings

Some strings are initialized without wrapping them in _(); instead,
_() is applied on the variable when it is used.

This is incorrect, since these strings don't get added to the catalog.
Fix that by applying _() only once, when the string is declared.

Signed-off-by: Baptiste Jonglez <baptiste--git@jonglez.org>
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/custom.c

@@ -1044,7 +1044,7 @@ void custom_config_main(void)
       else {
         colorize = 0;
         wins_erase_status_bar();
-        mvwprintw(win[STA].p, 0, 0, _(no_color_support));
+        mvwprintw(win[STA].p, 0, 0, no_color_support);
         wgetch(win[STA].p);
       }
       break;