diff -Naur thunderbird.orig/mozconfig thunderbird/mozconfig
--- thunderbird.orig/mozconfig	2016-08-03 15:47:47.281638448 +0200
+++ thunderbird/mozconfig	2016-08-03 15:48:52.470875981 +0200
@@ -23,6 +23,7 @@
 ac_add_options --enable-system-pixman
 
 # Features
+ac_add_options --enable-calendar
 ac_add_options --enable-startup-notification
 ac_add_options --disable-gstreamer
 ac_add_options --disable-updater
diff -Naur thunderbird.orig/PKGBUILD thunderbird/PKGBUILD
--- thunderbird.orig/PKGBUILD	2016-08-03 15:47:47.281638448 +0200
+++ thunderbird/PKGBUILD	2016-08-03 15:48:52.470875981 +0200
@@ -7,6 +7,7 @@
 
 pkgname=thunderbird
 pkgver=45.2.0
+_tagname=45_2_0
 pkgrel=1
 pkgdesc="Standalone mail and news reader from mozilla.org"
 arch=('i686' 'x86_64')
@@ -16,7 +17,7 @@
          'dbus-glib' 'alsa-lib' 'libvpx' 'libevent' 'nss' 'hunspell'
          'sqlite' 'ttf-font' 'icu')
 makedepends=('unzip' 'zip' 'diffutils' 'python2' 'yasm' 'mesa' 'imake' 'gconf'
-             'libpulse' 'inetutils')
+             'libpulse' 'inetutils' 'python2-compare-locales')
 optdepends=('libcanberra: for sound support')
 options=('!emptydirs' '!makeflags')
 source=(https://ftp.mozilla.org/pub/mozilla.org/thunderbird/releases/$pkgver/source/thunderbird-$pkgver.source.tar.xz
@@ -26,7 +27,7 @@
         firefox-gcc-6.0.patch mozilla-1228540.patch mozilla-1228540-1.patch
         vendor.js)
 sha256sums=('bd2389cbb28138668ab41b26f1dce49c455807e09b43fd370ee765ae3f0937c0'
-            'b884ccab9bea135600b41a2359073e637dee96dac64d22aceec4adb7fd936b23'
+            'e5908af1fc6a22eebef8780cfd379d1ab30f64a293095ce9a01bad27e987650d'
             '3fba13d88aeb003ab0811ef739463858172ce0662a1c7d62835df3d83ddbb8fb'
             '24599eab8862476744fe1619a9a53a5b8cdcab30b3fc5767512f31d3529bd05d'
             '4d1e1ddabc9e975ed39f49e134559a29e01cd49439e358233f1ede43bf5a52bf'
@@ -48,8 +49,17 @@
 # more information.
 _mozilla_api_key=16674381-f021-49de-8622-3021c5942aff
 
-
 prepare() {
+  # Download translations
+  _locales=$(sed -e '/ osx/d' -e 's/ linux win32//' -e '/en-US/d' $pkgname-$pkgver/mail/locales/shipped-locales)
+  [ -e i18n ] && rm -r i18n
+  mkdir i18n && pushd i18n
+  for lang in $_locales; do
+    curl http://hg.mozilla.org/releases/l10n/mozilla-release/$lang/archive/THUNDERBIRD_${_tagname}_RELEASE.tar.gz | tar zxf -
+    mv $lang-THUNDERBIRD_${_tagname}_RELEASE $lang
+  done
+  popd
+
   cd $pkgname-$pkgver
 
   cp ../mozconfig .mozconfig
@@ -89,6 +99,25 @@
   export PATH="$srcdir/path:$PATH"
 
   make -f client.mk build
+
+  _locales=$(sed -e '/ osx/d' -e 's/ linux win32//' -e '/en-US/d' mail/locales/shipped-locales)
+
+  # Include translations in Lightning
+  pushd obj-*-linux-gnu/calendar/lightning
+  for lang in $_locales; do
+    make LOCALE_MERGEDIR="$srcdir/i18n-merged/$lang" L10NBASEDIR="$srcdir/i18n" merge-$lang
+    make LOCALE_MERGEDIR="$srcdir/i18n-merged/$lang" L10NBASEDIR="$srcdir/i18n" libs-$lang
+  done
+  make tools
+  popd
+
+  # Create langpacks
+  pushd obj-*-linux-gnu/mail/locales
+  for lang in $_locales; do
+    make LOCALE_MERGEDIR="$srcdir/i18n-merged/$lang" L10NBASEDIR="$srcdir/i18n" merge-$lang
+    make LOCALE_MERGEDIR="$srcdir/i18n-merged/$lang" L10NBASEDIR="$srcdir/i18n" langpack-$lang
+  done
+  popd
 }
 
 package() {
@@ -97,6 +126,12 @@
 
   install -Dm644 ../vendor.js "$pkgdir/usr/lib/thunderbird/defaults/preferences/vendor.js"
 
+  # Install langpacks
+  for langpack in obj-x*-linux-gnu/dist/linux-*/xpi/thunderbird-$pkgver.*.langpack.xpi; do
+    _extension_name=`basename $langpack | sed "s/thunderbird-$pkgver.\(.*\).langpack.xpi/langpack-\1@thunderbird.mozilla.org.xpi/"`
+    install -Dm644 "$langpack" "$pkgdir/usr/lib/thunderbird/extensions/$_extension_name";
+  done
+
   for i in 16 22 24 32 48 256; do
       install -Dm644 other-licenses/branding/thunderbird/mailicon$i.png \
           "$pkgdir/usr/share/icons/hicolor/${i}x${i}/apps/thunderbird.png"