diff --git a/user_manual/locale/cs/LC_MESSAGES/pim/sync_thunderbird.pot b/user_manual/locale/cs/LC_MESSAGES/pim/sync_thunderbird.pot
index cfd9421db..d127773ed 100644
--- a/user_manual/locale/cs/LC_MESSAGES/pim/sync_thunderbird.pot
+++ b/user_manual/locale/cs/LC_MESSAGES/pim/sync_thunderbird.pot
@@ -1,20 +1,20 @@
 # SOME DESCRIPTIVE TITLE.
-# Copyright (C) 2020 Nextcloud GmbH
+# Copyright (C) 2021 Nextcloud GmbH
 # This file is distributed under the same license as the Nextcloud latest User Manual package.
 # FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
 # 
 # Translators:
-# Pavel Borecki <pavel.borecki@gmail.com>, 2020
 # Michal Breškovec <michal@breskovec.cz>, 2020
+# Pavel Borecki <pavel.borecki@gmail.com>, 2021
 # 
 #, fuzzy
 msgid ""
 msgstr ""
 "Project-Id-Version: Nextcloud latest User Manual latest\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-10-20 08:22+0000\n"
+"POT-Creation-Date: 2021-01-15 21:30+0000\n"
 "PO-Revision-Date: 2019-11-07 20:29+0000\n"
-"Last-Translator: Michal Breškovec <michal@breskovec.cz>, 2020\n"
+"Last-Translator: Pavel Borecki <pavel.borecki@gmail.com>, 2021\n"
 "Language-Team: Czech (https://www.transifex.com/nextcloud/teams/64236/cs/)\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
@@ -54,36 +54,36 @@ msgstr "Pro tuto metodu je třeba mít nainstalované tři doplňky:"
 #: ../../pim/sync_thunderbird.rst:13
 msgid ""
 "The `Lightning calendar "
-"<https://addons.thunderbird.net/de/thunderbird/addon/lightning/>`_ (Only "
-"needed for Thunderbird versions up to 68)"
+"<https://addons.thunderbird.net/en/thunderbird/addon/lightning/>`_ (Only "
+"needed for Thunderbird versions up to 68)."
 msgstr ""
 "`Kalendář Lightning "
-"<https://addons.thunderbird.net/de/thunderbird/addon/lightning/>`_ (Potřebný"
+"<https://addons.thunderbird.net/en/thunderbird/addon/lightning/>`_ (Potřebný"
 " jen pro Thunderbird starší, než verze 68)"
 
 #: ../../pim/sync_thunderbird.rst:14
 msgid ""
-"`TBSync <https://addons.thunderbird.net/de/thunderbird/addon/tbsync/>`_ and"
+"`TBSync <https://addons.thunderbird.net/en/thunderbird/addon/tbsync/>`_."
 msgstr ""
-"`TBSync <https://addons.thunderbird.net/de/thunderbird/addon/tbsync/>`_ a"
+"`TBSync <https://addons.thunderbird.net/en/thunderbird/addon/tbsync/>`_."
 
 #: ../../pim/sync_thunderbird.rst:15
 msgid ""
 "The `TBSync provider for CalDAV and CardDAV "
-"<https://addons.thunderbird.net/de/thunderbird/addon/dav-4-tbsync/>`_"
+"<https://addons.thunderbird.net/en/thunderbird/addon/dav-4-tbsync/>`_."
 msgstr ""
 "`TBSync poskytovatel pro CalDAV a CardDAV "
-"<https://addons.thunderbird.net/de/thunderbird/addon/dav-4-tbsync/>`_"
+"<https://addons.thunderbird.net/en/thunderbird/addon/dav-4-tbsync/>`_"
 
 #: ../../pim/sync_thunderbird.rst:17
 msgid ""
 "When they are installed, if you are on Windows, go to "
 "**Extras**/**Synchronisation settings (TBSync)** or **Edit/Synchronisation "
-"settings (TBSync)** if on Linux"
+"settings (TBSync)** if on Linux, and then:"
 msgstr ""
 "Když jsou nainstalovány, pokud používáte Windows, jděte do "
 "**Extra**/**Nastavení synchronizace (TBSync)** nebo **Upravit/Nastavení "
-"synchronizace (TBSync)** pokud na Linuxu"
+"synchronizace (TBSync)** pokud na Linuxu a potom:"
 
 #: ../../pim/sync_thunderbird.rst:19
 msgid ""
@@ -111,10 +111,10 @@ msgstr ""
 #: ../../pim/sync_thunderbird.rst:22
 msgid ""
 "In the next window, TBSync should have autodiscovered the CalDAV and CardDAV"
-" addresses. When it has, click **Finish**."
+" addresses. When it has, click **Finish**"
 msgstr ""
 "V dalším okně by TBSync mělo automaticky objevit CalDAV a CardDAV adresy. "
-"Pokud ano, klikněte na **Dokončit**."
+"Pokud ano, klikněte na **Dokončit**"
 
 #: ../../pim/sync_thunderbird.rst:23
 msgid ""
@@ -130,7 +130,7 @@ msgstr ""
 msgid ""
 "Check the box next to each calender and address book you want to have "
 "synchronised, also set how often you want them to be synchronised and push "
-"the button **sychronise now**"
+"the button **sychronize now**"
 msgstr ""
 "Zaškrtněte kolonku vedle každého z kalendářů, které chcete synchronizovat, "
 "také nastavte, jak často chcete, aby byly synchronizovány a stiskněte "
@@ -152,25 +152,25 @@ msgstr "Alternativa: Použití doplňku CardBook (pouze kontakty)"
 
 #: ../../pim/sync_thunderbird.rst:30
 msgid ""
-"`CardBook <https://addons.thunderbird.net/de/thunderbird/addon/cardbook/>`_ "
+"`CardBook <https://addons.thunderbird.net/en/thunderbird/addon/cardbook/>`_ "
 "is an advanced alternative to Thunderbird's address book, which supports "
 "CardDAV. You can have TBSync and CardBook installed in parallel."
 msgstr ""
-"`CardBook <https://addons.thunderbird.net/de/thunderbird/addon/cardbook/>`_ "
+"`CardBook <https://addons.thunderbird.net/en/thunderbird/addon/cardbook/>`_ "
 "je pokročilá alternativa k adresáři kontaktů v Thunderbirdu, která podporuje"
 " CardDAV. TBSync a CardBook je možné mít nainstalované vedle sebe."
 
 #: ../../pim/sync_thunderbird.rst:32
-msgid "Click the Cardbook icon in the upper right corner of Thunderbird:"
-msgstr "Klikněte na ikonu Cardbook v pravém horním rohu okna s Thunderbird:"
+msgid "Click the CardBook icon in the upper right corner of Thunderbird:"
+msgstr "Klikněte na ikonu CardBook v pravém horním rohu okna s Thunderbird:"
 
 #: ../../pim/sync_thunderbird.rst:36
-msgid "In Cardbook:"
-msgstr "V Cardbook:"
+msgid "In CardBook:"
+msgstr "V CardBook:"
 
 #: ../../pim/sync_thunderbird.rst:38
-msgid "\"Adressbook > New Adressbook **Remote** > Next"
-msgstr "\"Adresář > Nový adresář **Vzdálený** > Další"
+msgid "\"Address book > New Address book **Remote** > Next"
+msgstr "\"Adresář kontaktů > Nový adresář **Vzdálený** > Další"
 
 #: ../../pim/sync_thunderbird.rst:39
 msgid ""
@@ -182,17 +182,17 @@ msgstr ""
 
 #: ../../pim/sync_thunderbird.rst:43
 msgid ""
-"Click on \"Validate\", click Next, then choose the name of the addressbook "
-"and click Next again."
+"Click on \"Validate\", click Next, then choose the name of the address book "
+"and click Next again:"
 msgstr ""
 "Klikněte na „Ověřit“, klikněte na Další, pak zvolte název adresáře kontaktů "
-"a znovu klikněte na další."
+"a znovu klikněte na další:"
 
 #: ../../pim/sync_thunderbird.rst:47
 msgid ""
-"When you are finished, CardBook synchronizes your addressbooks. You can "
+"When you are finished, CardBook synchronizes your address books. You can "
 "always trigger a synchronisation manually by clicking \"Synchronize\" in the"
-" top left corner of CardBook."
+" top left corner of CardBook:"
 msgstr ""
 "Když máte hotovo,, CardBook synchronizuje vaše adresáře kontaktů. Vždy ale "
 "můžete synchronizaci spustit i ručně kliknutím na „Synchronizovat“ v levém "
@@ -208,17 +208,21 @@ msgstr "Tato metoda je potřebná pouze pokud nechcete nainstalovat TBSync."
 
 #: ../../pim/sync_thunderbird.rst:55
 msgid ""
-"1. Go to your Nextcloud Calendar and click on the 3 dotted menu for the "
+"Go to your Nextcloud Calendar and click on the 3 dotted menu for the "
 "calendar that you want to synchronize which will display and URL that looks "
-"something like this: "
-"https://cloud.nextcloud.com/remote.php/dav/calendars/daniel/personal/"
+"something like this:"
 msgstr ""
-"1. Jděte do Nextcloud Kalendář a klikněte na nabídku „tři tečky“ pro "
-"kalendář, který chcete synchronizovat, která se zobrazí a a URL adresu, "
-"která vypadá nějak takto: "
-"https://cloud.nextcloud.com/remote.php/dav/calendars/daniel/personal/"
+"Jděte do Nextcloud Kalendář a klikněte na nabídku „tři tečky“ pro kalendář, "
+"který chcete synchronizovat, která se zobrazí a a URL adresu, která vypadá "
+"nějak takto:"
 
-#: ../../pim/sync_thunderbird.rst:58
+#: ../../pim/sync_thunderbird.rst:57
+msgid ""
+"``https://cloud.nextcloud.com/remote.php/dav/calendars/daniel/personal/``"
+msgstr ""
+"``https://cloud.nextcloud.com/remote.php/dav/calendars/daniel/personal/``"
+
+#: ../../pim/sync_thunderbird.rst:59
 msgid ""
 "Go to the calendar view in Thunderbird and right click in the calendar menu "
 "to the left (where the names of the calendars are) to add a **New "
@@ -228,28 +232,28 @@ msgstr ""
 "tlačítkem na nabídku kalendáře (kde se nacházejí názvy kalendářů) pro "
 "přidání **Nového kalendáře**."
 
-#: ../../pim/sync_thunderbird.rst:60
-msgid "Choose **On the network**"
-msgstr "Zvolte **Na síti**"
+#: ../../pim/sync_thunderbird.rst:61
+msgid "Choose **On the Network**:"
+msgstr "Zvolte **Na síti**:"
 
-#: ../../pim/sync_thunderbird.rst:64
+#: ../../pim/sync_thunderbird.rst:65
 msgid "Choose **CalDAV** and fill in the missing information:"
 msgstr "Zvolte **CalDAV** a vyplňte chybějící informace:"
 
-#: ../../pim/sync_thunderbird.rst:69
+#: ../../pim/sync_thunderbird.rst:70
 msgid "Fix for Thunderbird 60"
 msgstr "Oprava pro Thunderbird 60"
 
-#: ../../pim/sync_thunderbird.rst:70
+#: ../../pim/sync_thunderbird.rst:71
 msgid ""
 "If you are still using Thunderbird 60, you need to change a configuration "
 "setting to make CalDAV/CardDAV work around Thunderbird bug `#1468918 "
 "<https://bugzilla.mozilla.org/show_bug.cgi?id=1468912>`_ as described `here "
 "<https://help.nextcloud.com/t/thunderbird-60-problems-with-address-and-"
-"calendar-sync/35773>`_"
+"calendar-sync/35773>`_."
 msgstr ""
 "Pokud pořád ještě používáte Thunderbird 60, je třeba změnit nastavení, aby "
 "se obešla CalDAV/CardDAV chyba v Thunderbird `č. 1468918 "
 "<https://bugzilla.mozilla.org/show_bug.cgi?id=1468912>`_ jak je popsáno `zde"
 " <https://help.nextcloud.com/t/thunderbird-60-problems-with-address-and-"
-"calendar-sync/35773>`_"
+"calendar-sync/35773>`_."