diff --git a/calendar/resources/locale/cs-CZ/prefs.dtd b/calendar/resources/locale/cs-CZ/prefs.dtd
index dcabe78fbd5..6e11ce66723 100644
--- a/calendar/resources/locale/cs-CZ/prefs.dtd
+++ b/calendar/resources/locale/cs-CZ/prefs.dtd
@@ -73,14 +73,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Výchozí délka periody:" >
 
 <!ENTITY pref.weekstarts.label     "První den týdne:" >
-<!ENTITY pref.weekstarts.sunday    "Neděle" >
-<!ENTITY pref.weekstarts.monday    "Pondělí" >
-<!ENTITY pref.weekstarts.tuesday   "Útery" >
-<!ENTITY pref.weekstarts.wednesday "Středa" >
-<!ENTITY pref.weekstarts.thursday  "Čtvrtek" >
-<!ENTITY pref.weekstarts.friday    "Pátek" >
-<!ENTITY pref.weekstarts.saturday  "Sobota" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Výchozí počet týdnů:" >
diff --git a/calendar/resources/locale/cy-GB/prefs.dtd b/calendar/resources/locale/cy-GB/prefs.dtd
index badf317c83b..0a9f1d7f7f9 100644
--- a/calendar/resources/locale/cy-GB/prefs.dtd
+++ b/calendar/resources/locale/cy-GB/prefs.dtd
@@ -73,14 +73,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Hyd Cwsg Rhagsodedig:" >
 
 <!ENTITY pref.weekstarts.label     "Diwrnod Cynta'r Wythnos:" >
-<!ENTITY pref.weekstarts.sunday    "Dydd Sul" >
-<!ENTITY pref.weekstarts.monday    "Dydd Llun" >
-<!ENTITY pref.weekstarts.tuesday   "Dydd Mawrth" >
-<!ENTITY pref.weekstarts.wednesday "Dydd Mercher" >
-<!ENTITY pref.weekstarts.thursday  "Dydd Iau" >
-<!ENTITY pref.weekstarts.friday    "Dydd Gwener" >
-<!ENTITY pref.weekstarts.saturday  "Dydd Sadwrn" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Cyfanswm nifer rhagosodedig o Wythnosau:" >
diff --git a/calendar/resources/locale/de-AT/prefs.dtd b/calendar/resources/locale/de-AT/prefs.dtd
index b03f18b547a..b31713319e3 100644
--- a/calendar/resources/locale/de-AT/prefs.dtd
+++ b/calendar/resources/locale/de-AT/prefs.dtd
@@ -72,14 +72,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Standard-Zeit bis Erinnerung:" >
 
 <!ENTITY pref.weekstarts.label     "Erster Tag der Woche:" >
-<!ENTITY pref.weekstarts.sunday    "Sonntag" >
-<!ENTITY pref.weekstarts.monday    "Montag" >
-<!ENTITY pref.weekstarts.tuesday   "Dienstag" >
-<!ENTITY pref.weekstarts.wednesday "Mittwoch" >
-<!ENTITY pref.weekstarts.thursday  "Donnerstag" >
-<!ENTITY pref.weekstarts.friday    "Freitag" >
-<!ENTITY pref.weekstarts.saturday  "Samstag" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Standard-Gesamtanzahl der Wochen:" >
diff --git a/calendar/resources/locale/en-US/prefs.dtd b/calendar/resources/locale/en-US/prefs.dtd
index b9e84e21535..c602edcfbb1 100644
--- a/calendar/resources/locale/en-US/prefs.dtd
+++ b/calendar/resources/locale/en-US/prefs.dtd
@@ -73,14 +73,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Default Snooze Length:" >
 
 <!ENTITY pref.weekstarts.label     "First Day Of The Week:" >
-<!ENTITY pref.weekstarts.sunday    "Sunday" >
-<!ENTITY pref.weekstarts.monday    "Monday" >
-<!ENTITY pref.weekstarts.tuesday   "Tuesday" >
-<!ENTITY pref.weekstarts.wednesday "Wednesday" >
-<!ENTITY pref.weekstarts.thursday  "Thursday" >
-<!ENTITY pref.weekstarts.friday    "Friday" >
-<!ENTITY pref.weekstarts.saturday  "Saturday" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Default total number of Weeks:" >
diff --git a/calendar/resources/locale/es-ES/prefs.dtd b/calendar/resources/locale/es-ES/prefs.dtd
index 1495aa085e2..13585d14a97 100644
--- a/calendar/resources/locale/es-ES/prefs.dtd
+++ b/calendar/resources/locale/es-ES/prefs.dtd
@@ -71,14 +71,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Duración predeterminada del aviso:" >
 
 <!ENTITY pref.weekstarts.label     "Primer día de la semana:" >
-<!ENTITY pref.weekstarts.sunday    "Lunes" >
-<!ENTITY pref.weekstarts.monday    "Lunes" >
-<!ENTITY pref.weekstarts.tuesday   "Martes" >
-<!ENTITY pref.weekstarts.wednesday "Miércoles" >
-<!ENTITY pref.weekstarts.thursday  "Jueves" >
-<!ENTITY pref.weekstarts.friday    "Viernes" >
-<!ENTITY pref.weekstarts.saturday  "Sábado" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Número predeterminado total de semanas:" >
diff --git a/calendar/resources/locale/fr-FR/prefs.dtd b/calendar/resources/locale/fr-FR/prefs.dtd
index 3411b337151..01ddd046a26 100644
--- a/calendar/resources/locale/fr-FR/prefs.dtd
+++ b/calendar/resources/locale/fr-FR/prefs.dtd
@@ -73,14 +73,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Durée par défaut du snooze :" >
 
 <!ENTITY pref.weekstarts.label     "Premier jour de la semaine:" >
-<!ENTITY pref.weekstarts.sunday    "Dimanche" >
-<!ENTITY pref.weekstarts.monday    "Lundi" >
-<!ENTITY pref.weekstarts.tuesday   "Mardi" >
-<!ENTITY pref.weekstarts.wednesday "Mercredi" >
-<!ENTITY pref.weekstarts.thursday  "Jeudi" >
-<!ENTITY pref.weekstarts.friday    "Vendredi" >
-<!ENTITY pref.weekstarts.saturday  "Samedi" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Nombre total de semaines par défaut :" >
diff --git a/calendar/resources/locale/hu-HU/prefs.dtd b/calendar/resources/locale/hu-HU/prefs.dtd
index 98f4f0d4a88..beaf979b3db 100644
--- a/calendar/resources/locale/hu-HU/prefs.dtd
+++ b/calendar/resources/locale/hu-HU/prefs.dtd
@@ -75,14 +75,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Alapértelmezett szundihossz" >
 
 <!ENTITY pref.weekstarts.label     "A hét első napja" >
-<!ENTITY pref.weekstarts.sunday    "Vasárnap" >
-<!ENTITY pref.weekstarts.monday    "Hétfő" >
-<!ENTITY pref.weekstarts.tuesday   "Kedd" >
-<!ENTITY pref.weekstarts.wednesday "Szerda" >
-<!ENTITY pref.weekstarts.thursday  "Csütörtök" >
-<!ENTITY pref.weekstarts.friday    "Péntek" >
-<!ENTITY pref.weekstarts.saturday  "Szombat" >
-
 <!ENTITY pref.daysoff.label     "A hét szabadnapjai:" >
 
 <!ENTITY pref.numberofweeks.label     "Alapértelmezett összes hetek száma" >
diff --git a/calendar/resources/locale/ja-JP/prefs.dtd b/calendar/resources/locale/ja-JP/prefs.dtd
index a07cfde6249..014c8d3dc62 100644
--- a/calendar/resources/locale/ja-JP/prefs.dtd
+++ b/calendar/resources/locale/ja-JP/prefs.dtd
@@ -76,14 +76,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "スヌーズ間隔(デフォルト):" >
 
 <!ENTITY pref.weekstarts.label     "週の開始日:" >
-<!ENTITY pref.weekstarts.sunday    "日曜" >
-<!ENTITY pref.weekstarts.monday    "月曜" >
-<!ENTITY pref.weekstarts.tuesday   "火曜" >
-<!ENTITY pref.weekstarts.wednesday "水曜" >
-<!ENTITY pref.weekstarts.thursday  "木曜" >
-<!ENTITY pref.weekstarts.friday    "金曜" >
-<!ENTITY pref.weekstarts.saturday  "土曜" >
-
 <!ENTITY pref.daysoff.label     "休日扱い日:" >
 
 <!ENTITY pref.numberofweeks.label     "週の総数(デフォルト):" >
diff --git a/calendar/resources/locale/lt-LT/prefs.dtd b/calendar/resources/locale/lt-LT/prefs.dtd
index c32b516e152..4b1121f59ed 100644
--- a/calendar/resources/locale/lt-LT/prefs.dtd
+++ b/calendar/resources/locale/lt-LT/prefs.dtd
@@ -73,14 +73,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Numatytoji įvykio atidėjimo trukmė:" >
 
 <!ENTITY pref.weekstarts.label     "Pirmoji savaitės diena:" >
-<!ENTITY pref.weekstarts.sunday    "Sekmadienis" >
-<!ENTITY pref.weekstarts.monday    "Pirmadienis" >
-<!ENTITY pref.weekstarts.tuesday   "Antradienis" >
-<!ENTITY pref.weekstarts.wednesday "Trečiadienis" >
-<!ENTITY pref.weekstarts.thursday  "Ketvirtadienis" >
-<!ENTITY pref.weekstarts.friday    "Penktadienis" >
-<!ENTITY pref.weekstarts.saturday  "Šeštadienis" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Numatytasis savaičių skaičius:" >
diff --git a/calendar/resources/locale/nl-NL/prefs.dtd b/calendar/resources/locale/nl-NL/prefs.dtd
index 969abd36408..51ca914849d 100644
--- a/calendar/resources/locale/nl-NL/prefs.dtd
+++ b/calendar/resources/locale/nl-NL/prefs.dtd
@@ -73,14 +73,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Standaard snooze-duur:" >
 
 <!ENTITY pref.weekstarts.label     "Eerste dag van de week:" >
-<!ENTITY pref.weekstarts.sunday    "Zondag" >
-<!ENTITY pref.weekstarts.monday    "Maandag" >
-<!ENTITY pref.weekstarts.tuesday   " Dinsdag" >
-<!ENTITY pref.weekstarts.wednesday "Woensdag" >
-<!ENTITY pref.weekstarts.thursday  "Donderdag" >
-<!ENTITY pref.weekstarts.friday    "Vrijdag" >
-<!ENTITY pref.weekstarts.saturday  "Zaterdag" >
-
 <!ENTITY pref.daysoff.label     "Vrije dag(en) elke week:" >
 
 <!ENTITY pref.numberofweeks.label     "Standaard aantal weken:" >
diff --git a/calendar/resources/locale/pl-PL/prefs.dtd b/calendar/resources/locale/pl-PL/prefs.dtd
index c2ddcc2965f..f23da644407 100644
--- a/calendar/resources/locale/pl-PL/prefs.dtd
+++ b/calendar/resources/locale/pl-PL/prefs.dtd
@@ -71,14 +71,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Domyślna długość odstępu powiadamiania:" >
 
 <!ENTITY pref.weekstarts.label     "Pierwszy dzień tygodnia:" >
-<!ENTITY pref.weekstarts.sunday    "Niedziela" >
-<!ENTITY pref.weekstarts.monday    "Poniedziałek" >
-<!ENTITY pref.weekstarts.tuesday   "Wtorek" >
-<!ENTITY pref.weekstarts.wednesday "Środa" >
-<!ENTITY pref.weekstarts.thursday  "Czwartek" >
-<!ENTITY pref.weekstarts.friday    "Piątek" >
-<!ENTITY pref.weekstarts.saturday  "Sobota" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Domyślna liczba tygodni:" >
diff --git a/calendar/resources/locale/pt-BR/prefs.dtd b/calendar/resources/locale/pt-BR/prefs.dtd
index f1a4e2584fb..18f5b8af674 100644
--- a/calendar/resources/locale/pt-BR/prefs.dtd
+++ b/calendar/resources/locale/pt-BR/prefs.dtd
@@ -74,14 +74,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Dura&#xE7;&#xE3;o padr&#xE3;o de Soneca:" >
 
 <!ENTITY pref.weekstarts.label     "Primeiro Dia da Semana:" >
-<!ENTITY pref.weekstarts.sunday    "Domingo" >
-<!ENTITY pref.weekstarts.monday    "Segunda" >
-<!ENTITY pref.weekstarts.tuesday   "Ter&#xE7;a" >
-<!ENTITY pref.weekstarts.wednesday "Quarta" >
-<!ENTITY pref.weekstarts.thursday  "Quinta" >
-<!ENTITY pref.weekstarts.friday    "Sexta" >
-<!ENTITY pref.weekstarts.saturday  "S&#xE1;bado" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "N&#xFA;mero total padr&#xE3;o de Semanas:" >
diff --git a/calendar/resources/locale/sk-SK/prefs.dtd b/calendar/resources/locale/sk-SK/prefs.dtd
index 773fd09a649..5cf83ab669b 100644
--- a/calendar/resources/locale/sk-SK/prefs.dtd
+++ b/calendar/resources/locale/sk-SK/prefs.dtd
@@ -73,14 +73,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Východzia dĺžka periódy:" >
 
 <!ENTITY pref.weekstarts.label     "Prvý deň týždňa:" >
-<!ENTITY pref.weekstarts.sunday    "Nedeľa" >
-<!ENTITY pref.weekstarts.monday    "Pondelok" >
-<!ENTITY pref.weekstarts.tuesday   "Utorok" >
-<!ENTITY pref.weekstarts.wednesday "Streda" >
-<!ENTITY pref.weekstarts.thursday  "Štvrtok" >
-<!ENTITY pref.weekstarts.friday    "Piatok" >
-<!ENTITY pref.weekstarts.saturday  "Sobota" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Východzí počet týždňov:" >
diff --git a/calendar/resources/locale/sl-SI/prefs.dtd b/calendar/resources/locale/sl-SI/prefs.dtd
index 436a65afcd2..b15fa1d6dfe 100644
--- a/calendar/resources/locale/sl-SI/prefs.dtd
+++ b/calendar/resources/locale/sl-SI/prefs.dtd
@@ -73,14 +73,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Privzeti čas do opomnika:">
 
 <!ENTITY pref.weekstarts.label     "Prvi dan v tednu:">
-<!ENTITY pref.weekstarts.sunday    "Nedelja">
-<!ENTITY pref.weekstarts.monday    "Ponedeljek">
-<!ENTITY pref.weekstarts.tuesday   "Torek">
-<!ENTITY pref.weekstarts.wednesday "Sreda">
-<!ENTITY pref.weekstarts.thursday  "Četrtek">
-<!ENTITY pref.weekstarts.friday    "Petek">
-<!ENTITY pref.weekstarts.saturday  "Sobota">
-
 <!ENTITY pref.daysoff.label     "Prosti dnevi vsak teden:" >
 
 <!ENTITY pref.numberofweeks.label     "Privzeto skupno število tednov:">
diff --git a/calendar/resources/locale/sv-SE/prefs.dtd b/calendar/resources/locale/sv-SE/prefs.dtd
index 3f0eef83e54..0171a331666 100644
--- a/calendar/resources/locale/sv-SE/prefs.dtd
+++ b/calendar/resources/locale/sv-SE/prefs.dtd
@@ -74,14 +74,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Standard Snooze Längd:" >
 
 <!ENTITY pref.weekstarts.label     "Veckan Börjar Med:" >
-<!ENTITY pref.weekstarts.sunday    "Söndag" >
-<!ENTITY pref.weekstarts.monday    "Måndag" >
-<!ENTITY pref.weekstarts.tuesday   "Tisdag" >
-<!ENTITY pref.weekstarts.wednesday "Onsdag" >
-<!ENTITY pref.weekstarts.thursday  "Torsdag" >
-<!ENTITY pref.weekstarts.friday    "Fredag" >
-<!ENTITY pref.weekstarts.saturday  "Lördag" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Antal visade veckor som standard:" >
diff --git a/calendar/resources/locale/wen-DE/prefs.dtd b/calendar/resources/locale/wen-DE/prefs.dtd
index 923a2b6a0eb..bd6f8dc6153 100644
--- a/calendar/resources/locale/wen-DE/prefs.dtd
+++ b/calendar/resources/locale/wen-DE/prefs.dtd
@@ -73,14 +73,6 @@
 <!ENTITY pref.defaultsnoozelength.label   "Standardna dołhosć drěmka:" >
 
 <!ENTITY pref.weekstarts.label     "Prěni dźen tydźenja:" >
-<!ENTITY pref.weekstarts.sunday    "Njedźela" >
-<!ENTITY pref.weekstarts.monday    "Póndźela" >
-<!ENTITY pref.weekstarts.tuesday   "Wutora" >
-<!ENTITY pref.weekstarts.wednesday "Srjeda" >
-<!ENTITY pref.weekstarts.thursday  "Štwórtk" >
-<!ENTITY pref.weekstarts.friday    "Pjatk" >
-<!ENTITY pref.weekstarts.saturday  "Sobota" >
-
 <!ENTITY pref.daysoff.label     "Day(s) Off Each Week:" >
 
 <!ENTITY pref.numberofweeks.label     "Standardna cyłkowna ličba njedźelow:" >