Holidays

- Renamed all holiday files to include a locale, rather than just
  a country code.
- Enhanced update-holidays.pl add-on script to support regions,
  provide better error handling, error on missing Perl module,
  warnings on unavailable data, and help text.
- Updated documentation accordingly.

doc/man/task-tutorial.5.in

@@ -1621,7 +1621,7 @@ used most.  You can create your own, or use one of the samples to show holidays
 on the calendar.  Try adding this line to your ~/.taskrc file:
 
 .RS
-include /usr/local/share/doc/task/rc/holidays-US.rc
+include /usr/local/share/doc/task/rc/holidays.en-US.rc
 .RE
 
 Then:
@@ -1654,7 +1654,8 @@ $ task calendar
 Legend: today, due, due-today, overdue, weekend, holiday, weeknumber.
 .RE
 
-There are holiday files for CA, DE, ES, FR, NL, SE, UK and US.
+There are holiday files for be-BY, cs-CZ, da-DK, de-AT, de-DE, en-CA, en-GB,
+en-NZ, en-US, es-ES, fr-FR, it-IT, nb-NO, nl-NL and sv-SE locales.
 
 You can see the whole year, see due tasks as well, and see the holidays:
 

doc/man/taskrc.5.in

@@ -115,7 +115,7 @@ ones containing just the relevant configuration data like colors, etc.
 There are two excellent uses of includes in your .taskrc, shown here:
 
 .RS
-include /usr/local/share/doc/task/rc/holidays-US.rc
+include /usr/local/share/doc/task/rc/holidays.en-US.rc
 .br
 include /usr/local/share/doc/task/rc/dark-16.theme
 .RE
@@ -183,13 +183,6 @@ help text.
 
 .SS MISCELLANEOUS
 
-.TP
-.B locale=en-US
-The locale is a combination of ISO 639-1 language code and ISO 3166 country
-code.  If not specified, will assume en-US.  If specified, taskwarrior will
-locate the correct file of localized strings and proceed.  It is an error to
-specify a locale for which there is no strings file.
-
 .TP
 .B verbose=yes
 Controls some of the verbosity of taskwarrior.
@@ -562,7 +555,7 @@ be included like this:
 .RS
 .RS
 .br
-include /usr/local/share/doc/task/rc/holidays-US.rc
+include /usr/local/share/doc/task/rc/holidays.en-US.rc
 .RE
 .RE