diff --git a/toonz/sources/translations/chinese/colorfx.ts b/toonz/sources/translations/chinese/colorfx.ts
index 4102750..b986f8b 100644
--- a/toonz/sources/translations/chinese/colorfx.ts
+++ b/toonz/sources/translations/chinese/colorfx.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="zh_CN">
+<TS version="2.1" language="zh_CN" sourcelanguage="en">
 <context>
     <name>ArtisticSolidColor</name>
     <message>
diff --git a/toonz/sources/translations/chinese/image.ts b/toonz/sources/translations/chinese/image.ts
index 338887e..dc5000d 100644
--- a/toonz/sources/translations/chinese/image.ts
+++ b/toonz/sources/translations/chinese/image.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="zh_CN">
+<TS version="2.1" language="zh_CN" sourcelanguage="en">
 <context>
     <name>AviWriterProperties</name>
     <message>
diff --git a/toonz/sources/translations/chinese/tnzcore.ts b/toonz/sources/translations/chinese/tnzcore.ts
index 8d27d99..09890f9 100644
--- a/toonz/sources/translations/chinese/tnzcore.ts
+++ b/toonz/sources/translations/chinese/tnzcore.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="zh_CN">
+<TS version="2.1" language="zh_CN" sourcelanguage="en">
 <context>
     <name>BmpWriterProperties</name>
     <message>
diff --git a/toonz/sources/translations/chinese/tnztools.ts b/toonz/sources/translations/chinese/tnztools.ts
index b02471e..64eca38 100644
--- a/toonz/sources/translations/chinese/tnztools.ts
+++ b/toonz/sources/translations/chinese/tnztools.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="zh_CN">
+<TS version="2.1" language="zh_CN" sourcelanguage="en">
 <context>
     <name>ArrowToolOptionsBox</name>
     <message>
diff --git a/toonz/sources/translations/chinese/toonz.ts b/toonz/sources/translations/chinese/toonz.ts
index c3dadd0..612d33c 100644
--- a/toonz/sources/translations/chinese/toonz.ts
+++ b/toonz/sources/translations/chinese/toonz.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="zh_CN">
+<TS version="2.1" language="zh_CN" sourcelanguage="en">
 <context>
     <name>AddFilmstripFramesPopup</name>
     <message>
diff --git a/toonz/sources/translations/chinese/toonzlib.ts b/toonz/sources/translations/chinese/toonzlib.ts
index 2f69c6c..c306d6e 100644
--- a/toonz/sources/translations/chinese/toonzlib.ts
+++ b/toonz/sources/translations/chinese/toonzlib.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="zh_CN">
+<TS version="2.1" language="zh_CN" sourcelanguage="en">
 <context>
     <name>CenterlineVectorizer</name>
     <message>
diff --git a/toonz/sources/translations/chinese/toonzqt.ts b/toonz/sources/translations/chinese/toonzqt.ts
index 7f7879b..f4cb8fa 100644
--- a/toonz/sources/translations/chinese/toonzqt.ts
+++ b/toonz/sources/translations/chinese/toonzqt.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="zh_CN">
+<TS version="2.1" language="zh_CN" sourcelanguage="en">
 <context>
     <name>AddFxContextMenu</name>
     <message>
diff --git a/toonz/sources/translations/czech/colorfx.ts b/toonz/sources/translations/czech/colorfx.ts
index cbc9b72..97279ec 100644
--- a/toonz/sources/translations/czech/colorfx.ts
+++ b/toonz/sources/translations/czech/colorfx.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="cs_CZ">
+<TS version="2.1" language="cs_CZ" sourcelanguage="en">
 <context>
     <name>ArtisticSolidColor</name>
     <message>
diff --git a/toonz/sources/translations/czech/image.ts b/toonz/sources/translations/czech/image.ts
index 3c29cf4..5aa4ef6 100644
--- a/toonz/sources/translations/czech/image.ts
+++ b/toonz/sources/translations/czech/image.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="cs_CZ">
+<TS version="2.1" language="cs_CZ" sourcelanguage="en">
 <context>
     <name>AviWriterProperties</name>
     <message>
diff --git a/toonz/sources/translations/czech/tnzcore.ts b/toonz/sources/translations/czech/tnzcore.ts
index 8f8bf49..9cecf53 100644
--- a/toonz/sources/translations/czech/tnzcore.ts
+++ b/toonz/sources/translations/czech/tnzcore.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="cs_CZ">
+<TS version="2.1" language="cs_CZ" sourcelanguage="en">
 <context>
     <name>BmpWriterProperties</name>
     <message>
diff --git a/toonz/sources/translations/czech/tnztools.ts b/toonz/sources/translations/czech/tnztools.ts
index 930a8b8..37c7287 100644
--- a/toonz/sources/translations/czech/tnztools.ts
+++ b/toonz/sources/translations/czech/tnztools.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="cs_CZ">
+<TS version="2.1" language="cs_CZ" sourcelanguage="en">
 <context>
     <name>ArrowToolOptionsBox</name>
     <message>
diff --git a/toonz/sources/translations/czech/toonz.ts b/toonz/sources/translations/czech/toonz.ts
index de80392..e72385b 100644
--- a/toonz/sources/translations/czech/toonz.ts
+++ b/toonz/sources/translations/czech/toonz.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="cs_CZ">
+<TS version="2.1" language="cs_CZ" sourcelanguage="en">
 <context>
     <name>AddFilmstripFramesPopup</name>
     <message>
diff --git a/toonz/sources/translations/czech/toonzlib.ts b/toonz/sources/translations/czech/toonzlib.ts
index c3c9d13..a707255 100644
--- a/toonz/sources/translations/czech/toonzlib.ts
+++ b/toonz/sources/translations/czech/toonzlib.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="cs_CZ">
+<TS version="2.1" language="cs_CZ" sourcelanguage="en">
 <context>
     <name>Preferences</name>
     <message>
diff --git a/toonz/sources/translations/czech/toonzqt.ts b/toonz/sources/translations/czech/toonzqt.ts
index 4233e26..222d9e4 100644
--- a/toonz/sources/translations/czech/toonzqt.ts
+++ b/toonz/sources/translations/czech/toonzqt.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="cs_CZ">
+<TS version="2.1" language="cs_CZ" sourcelanguage="en">
 <context>
     <name>AddFxContextMenu</name>
     <message>
diff --git a/toonz/sources/translations/italian/colorfx.ts b/toonz/sources/translations/italian/colorfx.ts
index e707730..9629ce6 100644
--- a/toonz/sources/translations/italian/colorfx.ts
+++ b/toonz/sources/translations/italian/colorfx.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1">
+<TS version="2.1" language="it" sourcelanguage="en">
 <context>
     <name>ArtisticSolidColor</name>
     <message>
diff --git a/toonz/sources/translations/italian/image.ts b/toonz/sources/translations/italian/image.ts
index fa9a74c..b50fd8b 100644
--- a/toonz/sources/translations/italian/image.ts
+++ b/toonz/sources/translations/italian/image.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1">
+<TS version="2.1" language="it" sourcelanguage="en">
 <context>
     <name>AviWriterProperties</name>
     <message>
diff --git a/toonz/sources/translations/italian/tnzcore.ts b/toonz/sources/translations/italian/tnzcore.ts
index 021262b..283953c 100644
--- a/toonz/sources/translations/italian/tnzcore.ts
+++ b/toonz/sources/translations/italian/tnzcore.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1">
+<TS version="2.1" language="it" sourcelanguage="en">
 <context>
     <name>BmpWriterProperties</name>
     <message>
diff --git a/toonz/sources/translations/italian/tnztools.ts b/toonz/sources/translations/italian/tnztools.ts
index a0715f9..458c9eb 100644
--- a/toonz/sources/translations/italian/tnztools.ts
+++ b/toonz/sources/translations/italian/tnztools.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1">
+<TS version="2.1" language="it" sourcelanguage="en">
 <context>
     <name>ArrowToolOptionsBox</name>
     <message>
diff --git a/toonz/sources/translations/italian/toonz.ts b/toonz/sources/translations/italian/toonz.ts
index 653c4b2..abc1a18 100644
--- a/toonz/sources/translations/italian/toonz.ts
+++ b/toonz/sources/translations/italian/toonz.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1">
+<TS version="2.1" language="it" sourcelanguage="en">
 <context>
     <name>AddFilmstripFramesPopup</name>
     <message>
diff --git a/toonz/sources/translations/italian/toonzlib.ts b/toonz/sources/translations/italian/toonzlib.ts
index 46cd1cf..fa0436c 100644
--- a/toonz/sources/translations/italian/toonzlib.ts
+++ b/toonz/sources/translations/italian/toonzlib.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1">
+<TS version="2.1" language="it" sourcelanguage="en">
 <context>
     <name>CenterlineVectorizer</name>
     <message>
diff --git a/toonz/sources/translations/italian/toonzqt.ts b/toonz/sources/translations/italian/toonzqt.ts
index c8afe17..770d229 100644
--- a/toonz/sources/translations/italian/toonzqt.ts
+++ b/toonz/sources/translations/italian/toonzqt.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1">
+<TS version="2.1" language="it" sourcelanguage="en">
 <context>
     <name>AddFxContextMenu</name>
     <message>
diff --git a/toonz/sources/translations/japanese/colorfx.ts b/toonz/sources/translations/japanese/colorfx.ts
index 38c8213..217e0eb 100644
--- a/toonz/sources/translations/japanese/colorfx.ts
+++ b/toonz/sources/translations/japanese/colorfx.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="ja_JP">
+<TS version="2.1" language="ja_JP" sourcelanguage="en">
 <context>
     <name>ArtisticSolidColor</name>
     <message>
diff --git a/toonz/sources/translations/japanese/image.ts b/toonz/sources/translations/japanese/image.ts
index 144ba4c..1089799 100644
--- a/toonz/sources/translations/japanese/image.ts
+++ b/toonz/sources/translations/japanese/image.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="ja_JP">
+<TS version="2.1" language="ja_JP" sourcelanguage="en">
 <context>
     <name>AviWriterProperties</name>
     <message>
diff --git a/toonz/sources/translations/japanese/tnzcore.ts b/toonz/sources/translations/japanese/tnzcore.ts
index 6ad238f..731c402 100644
--- a/toonz/sources/translations/japanese/tnzcore.ts
+++ b/toonz/sources/translations/japanese/tnzcore.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="ja_JP">
+<TS version="2.1" language="ja_JP" sourcelanguage="en">
 <context>
     <name>BmpWriterProperties</name>
     <message>
diff --git a/toonz/sources/translations/japanese/tnztools.ts b/toonz/sources/translations/japanese/tnztools.ts
index 1b8b3c0..5d5f586 100644
--- a/toonz/sources/translations/japanese/tnztools.ts
+++ b/toonz/sources/translations/japanese/tnztools.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="ja_JP">
+<TS version="2.1" language="ja_JP" sourcelanguage="en">
 <context>
     <name>ArrowToolOptionsBox</name>
     <message>
diff --git a/toonz/sources/translations/japanese/toonz.ts b/toonz/sources/translations/japanese/toonz.ts
index f1a9922..a342d29 100644
--- a/toonz/sources/translations/japanese/toonz.ts
+++ b/toonz/sources/translations/japanese/toonz.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="ja_JP">
+<TS version="2.1" language="ja_JP" sourcelanguage="en">
 <context>
     <name>AddFilmstripFramesPopup</name>
     <message>
diff --git a/toonz/sources/translations/japanese/toonzlib.ts b/toonz/sources/translations/japanese/toonzlib.ts
index ef65b6b..d148586 100644
--- a/toonz/sources/translations/japanese/toonzlib.ts
+++ b/toonz/sources/translations/japanese/toonzlib.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="ja_JP">
+<TS version="2.1" language="ja_JP" sourcelanguage="en">
 <context>
     <name>Preferences</name>
     <message>
diff --git a/toonz/sources/translations/japanese/toonzqt.ts b/toonz/sources/translations/japanese/toonzqt.ts
index 4b8eb48..b3e671c 100644
--- a/toonz/sources/translations/japanese/toonzqt.ts
+++ b/toonz/sources/translations/japanese/toonzqt.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="ja_JP">
+<TS version="2.1" language="ja_JP" sourcelanguage="en">
 <context>
     <name>AddFxContextMenu</name>
     <message>