Merge pull request #40665 from brendandburns/i18n

Automatic merge from submit-queue (batch tested with PRs 40665, 41094, 41351, 41721, 41843)

Update i18n tools and process.

@fabianofranz @zen @kubernetes/sig-cli-pr-reviews 

This is an update to the translation process based on feedback from folks.

The main changes are:
   * `msgctx` is being removed from the files.
   * String wrapping and string extraction have been separated.
   * More tools from the `gettext` family of tools are being used
   * Extracted strings are being sorted for canonical ordering
   * A `.pot` template has been added.

hack/update-translations.sh

@@ -0,0 +1,76 @@
+#!/bin/bash
+
+# Copyright 2017 The Kubernetes Authors.
+#
+# 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.
+
+KUBECTL_FILES="pkg/kubectl/cmd/*.go pkg/kubectl/cmd/*/*.go"
+
+generate_pot="false"
+generate_mo="false"
+
+while getopts "hf:xg" opt; do
+  case $opt in
+    h)
+      echo "$0 [-f files] [-x] [-g]"
+      echo " -f <file-path>: Files to process"
+      echo " -x extract strings to a POT file"
+      echo " -g sort .po files and generate .mo files"
+      exit 0
+      ;;
+    f)
+      KUBECTL_FILES="${OPTARG}"
+      ;;
+    x)
+      generate_pot="true"
+      ;;
+    g)
+      generate_mo="true"
+      ;;
+    \?)
+      echo "[-f <files>] -x -g" >&2
+      exit 1
+      ;;
+  esac
+done
+
+if ! which go-xgettext > /dev/null; then
+  echo 'Can not find go-xgettext, install with:'
+  echo 'go get github.com/gosexy/gettext/go-xgettext'
+  exit 1
+fi
+
+if ! which msgfmt > /dev/null; then
+  echo 'Can not find msgfmt, install with:'
+  echo 'apt-get install gettext'
+  exit 1
+fi
+
+if [[ "${generate_pot}" == "true" ]]; then
+  echo "Extracting strings to POT"
+  go-xgettext -k=i18n.T ${KUBECTL_FILES} > tmp.pot
+  msgcat -s tmp.pot > translations/kubectl/template.pot
+  rm tmp.pot
+fi
+
+if [[ "${generate_mo}" == "true" ]]; then
+  echo "Generating .po and .mo files"
+  for x in translations/*/*/*/*.po; do
+    msgcat -s $x > tmp.po
+    mv tmp.po $x
+    echo "generating .mo file for: $x"
+    msgfmt $x -o "$(dirname $x)/$(basename $x .po).mo"
+  done
+fi
+
+./hack/generate-bindata.sh