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 54f65b277..cfd9421db 100644
--- a/user_manual/locale/cs/LC_MESSAGES/pim/sync_thunderbird.pot
+++ b/user_manual/locale/cs/LC_MESSAGES/pim/sync_thunderbird.pot
@@ -5,15 +5,16 @@
 # 
 # Translators:
 # Pavel Borecki <pavel.borecki@gmail.com>, 2020
+# Michal Breškovec <michal@breskovec.cz>, 2020
 # 
 #, fuzzy
 msgid ""
 msgstr ""
 "Project-Id-Version: Nextcloud latest User Manual latest\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-10-05 20:47+0000\n"
+"POT-Creation-Date: 2020-10-20 08:22+0000\n"
 "PO-Revision-Date: 2019-11-07 20:29+0000\n"
-"Last-Translator: Pavel Borecki <pavel.borecki@gmail.com>, 2020\n"
+"Last-Translator: Michal Breškovec <michal@breskovec.cz>, 2020\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"
@@ -23,7 +24,7 @@ msgstr ""
 
 #: ../../pim/sync_thunderbird.rst:3
 msgid "Synchronizing with Thunderbird"
-msgstr "Synchronizace s aplikací Thunderbird"
+msgstr "Synchronizuji s aplikací Thunderbird"
 
 #: ../../pim/sync_thunderbird.rst:5
 msgid ""
@@ -53,10 +54,12 @@ 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/>`_"
+"<https://addons.thunderbird.net/de/thunderbird/addon/lightning/>`_ (Only "
+"needed for Thunderbird versions up to 68)"
 msgstr ""
 "`Kalendář Lightning "
-"<https://addons.thunderbird.net/de/thunderbird/addon/lightning/>`_"
+"<https://addons.thunderbird.net/de/thunderbird/addon/lightning/>`_ (Potřebný"
+" jen pro Thunderbird starší, než verze 68)"
 
 #: ../../pim/sync_thunderbird.rst:14
 msgid ""