diff --git a/locale/en.po b/locale/en.po
index f1aabcf..f2ff648 100644
--- a/locale/en.po
+++ b/locale/en.po
@@ -126,6 +126,10 @@ msgctxt "model:ir.message,text:msg_rep_reconciliation_fname"
 msgid "%(recname)s Reconciliation from %(date_from)s to %(date_to)s"
 msgstr "%(recname)s Reconciliation from %(date_from)s to %(date_to)s"
 
+msgctxt "model:ir.message,text:msg_line_date_before_book"
+msgid "The date of the cashbook line '%(recname)s' cannot be earlier than the start date '%(datebook)s' of the cashbook."
+msgstr "The date of the cashbook line '%(recname)s' cannot be earlier than the start date '%(datebook)s' of the cashbook."
+
 msgctxt "model:res.group,name:group_cashbook"
 msgid "Cashbook"
 msgstr "Cashbook"
@@ -274,14 +278,26 @@ msgctxt "model:ir.model.button,string:book_wfopen_button"
 msgid "Open"
 msgstr "Open"
 
+msgctxt "model:ir.model.button,help:book_wfopen_button"
+msgid "An open cashbook can be edited."
+msgstr "An open cashbook can be edited."
+
 msgctxt "model:ir.model.button,string:book_wfclosed_button"
 msgid "Close"
 msgstr "Close"
 
+msgctxt "model:ir.model.button,help:book_wfclosed_button"
+msgid "A closed cashbook can no longer be booked. However, it can be reopened afterwards."
+msgstr "A closed cashbook can no longer be booked. However, it can be reopened afterwards."
+
 msgctxt "model:ir.model.button,string:book_wfarchive_button"
 msgid "Archive"
 msgstr "Archive"
 
+msgctxt "model:ir.model.button,help:book_wfarchive_button"
+msgid "An archived cashbook is locked."
+msgstr "An archived cashbook is locked."
+
 msgctxt "model:ir.model.button,string:recon_wfedit_button"
 msgid "Edit"
 msgstr "Edit"
@@ -366,6 +382,10 @@ msgctxt "field:cashbook.book,start_balance:"
 msgid "Initial Amount"
 msgstr "Initial Amount"
 
+msgctxt "field:cashbook.book,start_date:"
+msgid "Initial Date"
+msgstr "Initial Date"
+
 msgctxt "field:cashbook.book,balance:"
 msgid "Balance"
 msgstr "Balance"