diff --git a/CHANGELOG.md b/CHANGELOG.md
index ecd5dcd72..bc512bbd2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,8 +6,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## 5.1.0 - undefined
 
-
-
 ### Added
 - VFS Encryption
 - File viewer in chats (Image/Animated Image/Video/Texts) with the option to export the file.
@@ -15,15 +13,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## 5.0.15 - undefined
 
-## Fixed
+### Fixed
 - Fix using only username in URI handlers.
 - Chat flickering on load.
 - Color of busy indicator when the chat is loading.
 - Update SDK to 5.2.42
 
+### Added
+- New language support: Czech
+
 ## 5.0.14 - 2023-03-16
 
-## Fixed
+### Fixed
 - Downgrade Qt back to 5.15.2 because of Qt commercial licence that break other GPL licences.
 - Show file extension image instead of thumbnails if image's size factor is too low/high.
 - Update SDK to 5.2.35 (ZLib vulnerability).
diff --git a/linphone-app/CMakeLists.txt b/linphone-app/CMakeLists.txt
index 9f6fe0d5a..cd6b85f47 100644
--- a/linphone-app/CMakeLists.txt
+++ b/linphone-app/CMakeLists.txt
@@ -475,7 +475,7 @@ endif()
 
 set(LANGUAGES_DIRECTORY "${ASSETS_DIR}/languages")
 set(I18N_FILENAME i18n.qrc)
-set(LANGUAGES da de en es fr_FR hu it ja lt pt_BR ru sv tr uk zh_CN)
+set(LANGUAGES cs da de en es fr_FR hu it ja lt pt_BR ru sv tr uk zh_CN)
 
 # ------------------------------------------------------------------------------
 
diff --git a/linphone-app/assets/languages/ja.ts b/linphone-app/assets/languages/ja.ts
index 416a0019d..072f0212b 100644
--- a/linphone-app/assets/languages/ja.ts
+++ b/linphone-app/assets/languages/ja.ts
@@ -1908,7 +1908,7 @@
     <message>
         <source>adminStatus</source>
         <extracomment>&apos;Admin&apos; : Admin(istrator)</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">管理者</translation>
         <extra-one>word for admin status</extra-one>
     </message>
     <message>
@@ -1938,7 +1938,7 @@
     <message>
         <source>cancelButton</source>
         <extracomment>&apos;Cancel&apos; : Cancel button</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">キャンセル</translation>
     </message>
     <message>
         <source>missingSubject</source>
@@ -1965,7 +1965,7 @@
     <message>
         <source>subjectLabel</source>
         <extracomment>&apos;Subject&apos; : Label of a text field about the subject of the conference</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">件名</translation>
     </message>
     <message>
         <source>subjectPlaceholder</source>
@@ -1975,18 +1975,18 @@
     <message>
         <source>subjectTooltip</source>
         <extracomment>&apos;Current subject of the Meeting. It cannot be empty&apos;</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">現在のチャットルームの件名です。空にすることはできません。</translation>
         <extra-Tooltip>Explanation about the subject of the meeting</extra-Tooltip>
     </message>
     <message>
         <source>askEncryption</source>
         <extracomment>&apos;Would you like to encrypt your meeting ?&apos; : Ask about setting the meeting as secured.</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">チャットを暗号化しますか？</translation>
     </message>
     <message>
         <source>participantSelectionPlaceholder</source>
         <extracomment>&apos;Select participants&apos; : Placeholder for a search on participant to add them in selection.</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">参加者を選択</translation>
     </message>
     <message>
         <source>participantSelectionTooltip</source>
@@ -1996,7 +1996,7 @@
     <message>
         <source>adminStatus</source>
         <extracomment>&apos;Admin&apos; : Admin(istrator)</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">管理者</translation>
         <extra-one>word for admin status</extra-one>
     </message>
     <message>
@@ -2218,23 +2218,23 @@
     <message>
         <source>addParticipantPlaceholder</source>
         <extracomment>&apos;Add Participants&apos; : Placeholder in a search bar for adding participant to the chat room</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">参加者を追加</translation>
     </message>
     <message>
         <source>addParticipantTooltip</source>
         <extracomment>&apos;Search participants in your contact list in order to invite them into the chat room.&apos;</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">チャットルームに招待するため、連絡先リストから参加者を検索します。</translation>
         <extra-Tooltip>Explanation for inviting the selected participants into chat room</extra-Tooltip>
     </message>
     <message>
         <source>participantList</source>
         <extracomment>&apos;Participant list&apos;</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">参加者リスト</translation>
     </message>
     <message>
         <source>adminStatus</source>
         <extracomment>&apos;Admin&apos; : Admin(istrator)</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">管理者</translation>
         <extra-one>word for admin status</extra-one>
     </message>
     <message>
@@ -3694,7 +3694,7 @@
     <message>
         <source>cancelButton</source>
         <extracomment>&apos;Cancel&apos; : Cancel button.</extracomment>
-        <translation type="unfinished"></translation>
+        <translation type="unfinished">キャンセル</translation>
     </message>
     <message>
         <source>startButton</source>