diff --git a/app/Dockerfile b/app/Dockerfile
index bfa780e9f..f91e92eb1 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -55,10 +55,13 @@ RUN apt-get update \
         libkf6texttemplate-dev \
         qt6-tools-dev-tools \
         qt6-tools-dev \
+        locales \
         unzip \
         python3 \
         python3-venv \
         python3-pip \
+    && locale-gen en_US.UTF-8 C.UTF-8 \
+    && update-locale LANG=C.UTF-8 LC_ALL=C.UTF-8 \
     && ln -sf /usr/bin/python3 /usr/local/bin/python3 \
     && ln -sf /usr/bin/python3 /usr/local/bin/python \
     && rm -rf /var/lib/apt/lists/*
diff --git a/qt-migration-legatus b/qt-migration-legatus
index 969e27390..b21bdbf41 160000
--- a/qt-migration-legatus
+++ b/qt-migration-legatus
@@ -1 +1 @@
-Subproject commit 969e27390480671ffa4a9e71d7516a0feaa20db8
+Subproject commit b21bdbf4108dcdd631239758939d7e4a92a846eb