diff --git a/backend/ar/sources.json b/backend/ar/sources.json
index b16cf7a1..5af4fec6 100644
--- a/backend/ar/sources.json
+++ b/backend/ar/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/de/sources.json b/backend/de/sources.json
index 67b4a18e..e46f3664 100644
--- a/backend/de/sources.json
+++ b/backend/de/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "Die Lizenz unter der das Werk ver\u00f6ffentlicht wurde.",
         "source_fulltext": "Volltext",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/dsb/sources.json b/backend/dsb/sources.json
index d8f73acc..cb61ff88 100644
--- a/backend/dsb/sources.json
+++ b/backend/dsb/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "Die Lizenz unter der das Werk ver\u00f6ffentlicht wurde.",
         "source_fulltext": "Volltext",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/en/sources.json b/backend/en/sources.json
index 5e030eb3..2dcd55c4 100644
--- a/backend/en/sources.json
+++ b/backend/en/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/es/sources.json b/backend/es/sources.json
index b16cf7a1..5af4fec6 100644
--- a/backend/es/sources.json
+++ b/backend/es/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/fr/sources.json b/backend/fr/sources.json
index b16cf7a1..5af4fec6 100644
--- a/backend/fr/sources.json
+++ b/backend/fr/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/hsb/sources.json b/backend/hsb/sources.json
index d8f73acc..cb61ff88 100644
--- a/backend/hsb/sources.json
+++ b/backend/hsb/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "Die Lizenz unter der das Werk ver\u00f6ffentlicht wurde.",
         "source_fulltext": "Volltext",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/hu/sources.json b/backend/hu/sources.json
index 794842d9..f001c6fc 100644
--- a/backend/hu/sources.json
+++ b/backend/hu/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/id/sources.json b/backend/id/sources.json
index 74611d4b..c3ce339c 100644
--- a/backend/id/sources.json
+++ b/backend/id/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "Lisensi sumber atau versi digitalnya.",
         "source_fulltext": "Teks lengkap",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/it/sources.json b/backend/it/sources.json
index b16cf7a1..5af4fec6 100644
--- a/backend/it/sources.json
+++ b/backend/it/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/iw/sources.json b/backend/iw/sources.json
index b16cf7a1..5af4fec6 100644
--- a/backend/iw/sources.json
+++ b/backend/iw/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/nl/sources.json b/backend/nl/sources.json
index b16cf7a1..5af4fec6 100644
--- a/backend/nl/sources.json
+++ b/backend/nl/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/pl/sources.json b/backend/pl/sources.json
index b16cf7a1..5af4fec6 100644
--- a/backend/pl/sources.json
+++ b/backend/pl/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/pt/sources.json b/backend/pt/sources.json
index b16cf7a1..5af4fec6 100644
--- a/backend/pt/sources.json
+++ b/backend/pt/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/tl/sources.json b/backend/tl/sources.json
index b16cf7a1..5af4fec6 100644
--- a/backend/tl/sources.json
+++ b/backend/tl/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file
diff --git a/backend/tr/sources.json b/backend/tr/sources.json
index 79cb5e34..e9a0dac1 100644
--- a/backend/tr/sources.json
+++ b/backend/tr/sources.json
@@ -65,6 +65,8 @@
         "license_explica": "The license of the source or the digitized version thereof.",
         "source_fulltext": "Full text",
         "editor": "Editor",
-        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field."
+        "editor_explica": "Editor or editors of this work. Type in and select an editor from the list. If none can be found, you can add a new one by clicking on the \"+\"-button in front of the text field.",
+        "booktitle": "Book title",
+        "booktitle_explica": "The book a chapter was published in."
     }
 }
\ No newline at end of file