Add language defaults for first-run experience and introduce Qt tool command wrapper

This commit sets default languages to English for the application unless the user specifies a different language, ensuring a consistent first-run experience across different system locales. Additionally, a wrapper for Qt tools is introduced in the CMake configuration for non-Windows platforms to filter out non-actionable output during builds.

cmake/qt_tool_wrapper.sh

@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+tool="${1:-}"
+shift || true
+
+if [[ -z "$tool" ]]; then
+  echo "qt_tool_wrapper.sh: missing tool argument" >&2
+  exit 2
+fi
+
+base="$(basename "$tool")"
+
+# Qt LinguistTools (lrelease) prints some noisy informational lines to stderr that
+# are not actionable during normal builds (e.g. "Removed plural forms...").
+# We filter only those specific messages.
+if [[ "$base" == "lrelease" ]]; then
+  "$tool" "$@" 2>&1 | sed \
+    -e '/^Removed plural forms as the target language has less forms\.$/d' \
+    -e '/^If this sounds wrong, possibly the target language is not set or recognized\.$/d'
+  exit "${PIPESTATUS[0]}"
+fi
+
+exec "$tool" "$@"
+