Add script to import strings, and doc.

Add GitHub action to sync strings.

.github/workflows/sync-from-external-sources.yml

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+name: Sync Data From External Sources
+on:
+  schedule:
+    # Every nights at 6
+    - cron: "0 6 * * *"
+
+jobs:
+  sync-strings:
+    runs-on: ubuntu-latest
+    # Skip in forks
+    if: github.repository == 'vector-im/element-x-android'
+    # No concurrency required, runs every time on a schedule.
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run local script
+        run: ./tools/strings/importStringsFromElement.sh
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v4
+        with:
+          commit-message: Import strings from Element Android
+          title: Sync strings
+          body: |
+            - Update strings from Element Android
+          branch: sync-strings
+          base: develop

libraries/ui-strings/README.md

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+## Module ui-strings
+
+This module contains strings from Element Android.
+
+The content of this module will be keep synced by the script `rootDir/tools/strings/importStringsFromElement.sh`, which is run daily by a GitHub action.
+
+### Adding new strings
+
+Add new strings to the file `./src/main/res/values/new_strings.xml`, or your new strings will be erased on the next sync.
+
+Also, new strings must be added to Element Android to give a chance to get translation.
+
+### Long term
+
+In the future, Weblate will be synced directly with this project.

tools/strings/importStringsFromElement.sh

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+#!/usr/bin/env bash
+
+#
+# Copyright (c) 2023 New Vector Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+printf "\n"
+printf "================================================================================\n"
+printf "|                    Importing strings from Element                            |\n"
+printf "================================================================================\n"
+
+basedir=`pwd`
+tmpPath="${basedir}/tmpStrings"
+
+## Delete tmp dir
+#rm -rf ${tmpPath}
+
+# Create tmp dir
+mkdir ${tmpPath}
+
+printf "\n================================================================================\n"
+printf "Downloading Element Android source from develop...\n"
+
+curl https://github.com/vector-im/element-android/archive/refs/heads/develop.zip -i -L -o ${tmpPath}/element.zip
+
+printf "\n================================================================================\n"
+printf "Unzipping Element Android source...\n"
+
+unzip -q ${tmpPath}/element.zip -d ${tmpPath}
+
+printf "\n================================================================================\n"
+printf "Importing the strings...\n"
+elementAndroidPath="${tmpPath}/element-android-develop"
+
+cp -R ${elementAndroidPath}/library/ui-strings/src/main/res ${basedir}/libraries/ui-strings/src/main
+
+## Delete tmp dir
+rm -rf ${tmpPath}
+
+# Commit all changes to git
+# git commit -a -m "Import strings from Element Android"
+
+printf "\n================================================================================\n"
+printf "Done\n"
+printf "================================================================================\n"