mv git submodule electrum-locale from contrib to electrum/locale

- this merges `contrib/deterministic-build/locale` and `electrum/locale`
- it is now once again possible have translations when running from a local git clone
    - which was already possible in the past before crowdin removed their unauthenticated APIs
        - see https://github.com/spesmilo/electrum/issues/9531
    - however, the translations available are the often-old frozen strings from electrum-locale
        - while previously one could just download the latest strings from crowdin

contrib/android/make_apk.sh

@@ -6,7 +6,6 @@ CONTRIB_ANDROID="$(dirname "$(readlink -e "$0")")"
 CONTRIB="$CONTRIB_ANDROID"/..
 PROJECT_ROOT="$CONTRIB"/..
 PACKAGES="$PROJECT_ROOT"/packages/
-LOCALE="$PROJECT_ROOT"/electrum/locale/
 
 . "$CONTRIB"/build_tools_util.sh
 
@@ -20,17 +19,19 @@ if [ ! -d "$PACKAGES" ]; then
     "$CONTRIB"/make_packages.sh || fail "make_packages failed"
 fi
 
-pushd "$PROJECT_ROOT"
-git submodule update --init
-popd
-
 # update locale
 info "preparing electrum-locale."
 (
+    cd "$PROJECT_ROOT"
+    git submodule update --init
+
     LOCALE="$PROJECT_ROOT/electrum/locale/"
+    cd "$LOCALE"
+    git clean -ffxd
+    git reset --hard
+    "$CONTRIB/build_locale.sh" "$LOCALE/locale" "$LOCALE/locale"
     # we want the binary to have only compiled (.mo) locale files; not source (.po) files
-    rm -rf "$LOCALE"
-    "$CONTRIB/build_locale.sh" "$CONTRIB/deterministic-build/electrum-locale/locale/" "$LOCALE"
+    rm -r locale/*/electrum.po
 )
 
 pushd "$CONTRIB_ANDROID"