diff --git a/lang/cs.json b/lang/cs.json
index 963f2224..64200884 100644
--- a/lang/cs.json
+++ b/lang/cs.json
@@ -166,5 +166,9 @@
     "Delete Source": "Smazat zdroj",
     "Revision History": "Historie revize",
     "Delete Family": "Smazat rodinu",
-    "simple": "jednoduchý"
+    "simple": "jednoduchý",
+    "Are you sure?": "Jste si jistí?",
+    "Yes": "Ano",
+    "Show more": "Zobrazit více",
+    "This action cannot be undone.": "Tuto akci nelze vrátit zpět."
 }
diff --git a/lang/nb.json b/lang/nb.json
index 9d72816e..699bbdc7 100644
--- a/lang/nb.json
+++ b/lang/nb.json
@@ -166,5 +166,9 @@
     "Upgrade database": "Oppgrader database",
     "simple": "enkel",
     "The Family Tree you are trying to load is in a schema version not supported by this version of Gramps Web. Therefore you cannot load this Family Tree without upgrading its schema. This action cannot be undone.": "Familietreet du forsøker å laste er i en skjemaversjon som ikke støttes av denne versjonen av Gramps Web. På grunn av dette kan du ikke laste inn dette familietreet uten å oppgradere dets skjema. Denne handlingen kan ikke omgjøres.",
-    "Clear the family tree by removing all existing objects. Optionally, select specific types of objects for deletion.": "Slett dette familietreet ved å fjerne alle eksisterende objekter. Alternativt kan du velge spesifikke typer objekter som skal slettes."
+    "Clear the family tree by removing all existing objects. Optionally, select specific types of objects for deletion.": "Slett dette familietreet ved å fjerne alle eksisterende objekter. Alternativt kan du velge spesifikke typer objekter som skal slettes.",
+    "Are you sure?": "Er du sikker?",
+    "This action cannot be undone.": "Denne handlingen kan ikke endres.",
+    "Show more": "Vis mer",
+    "Yes": "Ja"
 }
diff --git a/lang/nl.json b/lang/nl.json
index 4b66f718..ed106c98 100644
--- a/lang/nl.json
+++ b/lang/nl.json
@@ -38,7 +38,7 @@
     "Select an existing citation": "Selecteer een bestaand citaat",
     "Place Hierarchy": "Plaats-hiërarchie",
     "Keyboard Shortcuts": "Sneltoetsen",
-    "Show this dialog": "Toon deze dialoog",
+    "Show this dialog": "Deze dialoog weergeven",
     "To start using the blog, add a source with tag 'Blog'.": "Voeg een bron toe met label 'Blog' om de blog te gebruiken.",
     "Enter the details for the admin user.": "Voer de gegevens in voor de beheerder.",
     "SMTP port": "SMTP-poort",
@@ -87,7 +87,7 @@
     "Import user accounts": "Gebruikersaccounts importeren",
     "Generate a ZIP archive with all media files.": "Maak een zip-bestand aan met alle mediabestanden.",
     "Export your family tree": "Stamboom exporteren",
-    "Export your media files": "Uw mediabestanden exporteren",
+    "Export your media files": "Mediabestanden exporteren",
     "Error parsing JSON file": "Fout bij verwerking JSON-bestand",
     "Storing configuration": "Configuratie opslaan",
     "Importing family tree": "Stamboom importeren",
@@ -166,5 +166,9 @@
     "Delete Event": "Gebeurtenis verwijderen",
     "Revisions": "Revisies",
     "Delete Media": "Media verwijderen",
-    "simple": "eenvoudig"
+    "simple": "eenvoudig",
+    "Show more": "Meer weergeven",
+    "Are you sure?": "Weet u het zeker?",
+    "Yes": "Ja",
+    "This action cannot be undone.": "Deze actie kan niet ongedaan worden gemaakt."
 }
diff --git a/lang/pt_PT.json b/lang/pt_PT.json
index ed11e87d..6218a829 100644
--- a/lang/pt_PT.json
+++ b/lang/pt_PT.json
@@ -166,5 +166,9 @@
     "Delete all objects": "Eliminar todos os objectos",
     "Please re-enter your password to continue.": "Por favor, reinsira a senha para continuar.",
     "Upgrade database": "Actualizar a base de dados",
-    "simple": "simples"
+    "simple": "simples",
+    "This action cannot be undone.": "Esta acção não pode ser desfeita.",
+    "Show more": "Mostrar mais",
+    "Yes": "Sim",
+    "Are you sure?": "De certeza?"
 }
diff --git a/lang/sk.json b/lang/sk.json
index 68cc7338..be42de03 100644
--- a/lang/sk.json
+++ b/lang/sk.json
@@ -166,5 +166,9 @@
     "Revision History": "História revízie",
     "Revisions": "Revízie",
     "Delete Source": "Vymazať zdroj",
-    "simple": "jednoduchý"
+    "simple": "jednoduchý",
+    "Yes": "Áno",
+    "This action cannot be undone.": "Túto akciu nie je možné vrátiť späť.",
+    "Are you sure?": "Ste si istí?",
+    "Show more": "Zobraziť viac"
 }
diff --git a/lang/sv.json b/lang/sv.json
index d7266773..d2ba94c1 100644
--- a/lang/sv.json
+++ b/lang/sv.json
@@ -67,7 +67,7 @@
     "Contributor": "Bidragsgivare",
     "Editor": "Redaktör",
     "Owner": "Ägare",
-    "Add custom type": "Byt till anpassad typ",
+    "Add custom type": "Lägg till anpassad typ",
     "Switch to default type": "Byt till standardtyp",
     "Custom type": "Anpassad typ",
     "Replace file": "Byt ut fil",
@@ -167,5 +167,9 @@
     "Delete Tag": "Ta bort tagg",
     "Revisions": "Revisioner",
     "Add multiple objects": "Lägg till flera objekt",
-    "simple": "enkel"
+    "simple": "enkel",
+    "This action cannot be undone.": "Denna åtgärd kan inte ångras.",
+    "Yes": "Ja",
+    "Show more": "Visa mer",
+    "Are you sure?": "Är du säker?"
 }
diff --git a/lang/zh_TW.json b/lang/zh_TW.json
index 2fcc4e6b..28091fd7 100644
--- a/lang/zh_TW.json
+++ b/lang/zh_TW.json
@@ -1,4 +1,5 @@
 {
     "All": "全部",
-    "DNA": "DNA"
+    "DNA": "DNA",
+    "Yes": "是"
 }