diff --git a/localization/rssguard_en_GB.ts b/localization/rssguard_en_GB.ts
index 13bfc6ea1..46428702e 100644
--- a/localization/rssguard_en_GB.ts
+++ b/localization/rssguard_en_GB.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="en-GB" sourcelanguage="en">
+<TS version="2.1" language="en_GB" sourcelanguage="en">
   <context>
     <name>AccountCheckModel</name>
     <message>
diff --git a/localization/rssguard_en_US.ts b/localization/rssguard_en_US.ts
index 7443550c5..63a953ac6 100644
--- a/localization/rssguard_en_US.ts
+++ b/localization/rssguard_en_US.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="en-US" sourcelanguage="en">
+<TS version="2.1" language="en_US" sourcelanguage="en">
   <context>
     <name>AccountCheckModel</name>
     <message>
diff --git a/localization/rssguard_es.ts b/localization/rssguard_es.ts
index 990326d54..2e1700454 100644
--- a/localization/rssguard_es.ts
+++ b/localization/rssguard_es.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="es-ES" sourcelanguage="en">
+<TS version="2.1" language="es_ES" sourcelanguage="en">
   <context>
     <name>AccountCheckModel</name>
     <message>
diff --git a/localization/rssguard_pt.ts b/localization/rssguard_pt.ts
index 5b830bbe6..782008645 100644
--- a/localization/rssguard_pt.ts
+++ b/localization/rssguard_pt.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="pt-PT" sourcelanguage="en">
+<TS version="2.1" language="pt_PT" sourcelanguage="en">
   <context>
     <name>AccountCheckModel</name>
     <message>
diff --git a/localization/rssguard_pt_BR.ts b/localization/rssguard_pt_BR.ts
index 507ed0660..35916906f 100644
--- a/localization/rssguard_pt_BR.ts
+++ b/localization/rssguard_pt_BR.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="pt-BR" sourcelanguage="en">
+<TS version="2.1" language="pt_BR" sourcelanguage="en">
   <context>
     <name>AccountCheckModel</name>
     <message>
diff --git a/localization/rssguard_sv.ts b/localization/rssguard_sv.ts
index 886c81c09..4e3e0fc48 100644
--- a/localization/rssguard_sv.ts
+++ b/localization/rssguard_sv.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="sv-SE" sourcelanguage="en">
+<TS version="2.1" language="sv_SE" sourcelanguage="en">
   <context>
     <name>AccountCheckModel</name>
     <message>
diff --git a/localization/rssguard_zh_CN.ts b/localization/rssguard_zh_CN.ts
index 2aaed52e7..8bfae03d1 100644
--- a/localization/rssguard_zh_CN.ts
+++ b/localization/rssguard_zh_CN.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="zh-CN" sourcelanguage="en">
+<TS version="2.1" language="zh_CN" sourcelanguage="en">
   <context>
     <name>AccountCheckModel</name>
     <message>
diff --git a/localization/rssguard_zh_TW.ts b/localization/rssguard_zh_TW.ts
index 7430c6331..d889e7eb7 100644
--- a/localization/rssguard_zh_TW.ts
+++ b/localization/rssguard_zh_TW.ts
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE TS>
-<TS version="2.1" language="zh-TW" sourcelanguage="en">
+<TS version="2.1" language="zh_TW" sourcelanguage="en">
   <context>
     <name>AccountCheckModel</name>
     <message>