CI: Add daily base translation update

.github/workflows/cron_update_base_translation.yml

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+name: 🌎 Update Base Translation
+
+on:
+  schedule:
+    - cron: "0 0 * * *" # Every day at 12am UTC.
+  workflow_dispatch: # As well as manually.
+
+jobs:
+  update:
+    if: github.repository == 'PCSX2/pcsx2'
+    name: "Update Base Translation"
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Update Base Translation
+        run: ./.github/workflows/scripts/common/update_base_translation.sh
+      
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v5
+        with:
+          title: "Qt: Update Base Translation"
+          commit-message: "PAD: Update Base Translation"
+          committer: "PCSX2 Bot <PCSX2Bot@users.noreply.github.com>"
+          author: "PCSX2 Bot <PCSX2Bot@users.noreply.github.com>"
+          body: "Daily update of base translation sources."
+          branch: update-base-translation
+          delete-branch: true

.github/workflows/scripts/common/update_base_translation.sh

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+#!/bin/bash
+
+SCRIPTDIR=$(dirname "${BASH_SOURCE[0]}")
+source "$SCRIPTDIR/../linux/functions.sh"
+
+set -e
+
+# While we use custom Qt builds for our releases, the Qt6 package will be good enough
+# for just updating translations. Saves building it for this action alone.
+retry_command sudo apt-get -y install qt6-l10n-tools
+
+PATH=/usr/lib/qt6/bin:$PATH "$SCRIPTDIR/../../../../pcsx2-qt/Translations/update_en_translation.sh"

pcsx2-qt/Translations/update_en_translation.sh

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+#!/bin/bash
+
+SCRIPTDIR=$(dirname "${BASH_SOURCE[0]}")
+
+OPTS="-tr-function-alias QT_TRANSLATE_NOOP+=TRANSLATE,QT_TRANSLATE_NOOP+=TRANSLATE_SV,QT_TRANSLATE_NOOP+=TRANSLATE_STR,QT_TRANSLATE_N_NOOP3+=TRANSLATE_FMT,QT_TRANSLATE_NOOP+=TRANSLATE_NOOP"
+SRCDIRS=$(realpath "$SCRIPTDIR/..")/\ $(realpath "$SCRIPTDIR/../../pcsx2")/
+OUTDIR=$(realpath "$SCRIPTDIR")
+
+lupdate $SRCDIRS $OPTS -no-obsolete -source-language en -ts "$OUTDIR/pcsx2-qt_en.ts"