Correct description in messages; add 'tel' input type

Move description.txt to its proper place in the i18n messages file, and
add the 'tel' input data type.

BUG=615448
[email protected]

Review URL: https://codereview.chromium.org//2235683003 .
diff --git a/go-back-with-backspace/_locales/en/messages.json b/go-back-with-backspace/_locales/en/messages.json
index 6fdb719..92dfd7b 100644
--- a/go-back-with-backspace/_locales/en/messages.json
+++ b/go-back-with-backspace/_locales/en/messages.json
@@ -4,7 +4,7 @@
     "description": "Name of this extension."
   },
   "extensionDescription": {
-    "message": "Restores backspace as a back button.",
+    "message": "Re-enables the backspace key as a back navigation button (except when writing text).",
     "description": "Brief description of this extension."
   }
 }
diff --git a/go-back-with-backspace/build-zip.sh b/go-back-with-backspace/build-zip.sh
index fceb2fd..eeb9c92 100755
--- a/go-back-with-backspace/build-zip.sh
+++ b/go-back-with-backspace/build-zip.sh
@@ -20,7 +20,7 @@
 # Remove backup files.
 rm -f $(find . -name \*~ -or -name \#\*\#)
 
-if ! mkdir icons; then
+if ! mkdir -p icons; then
   echo "Error creating icons/ directory" >&2
   exit 1
 fi
diff --git a/go-back-with-backspace/description.txt b/go-back-with-backspace/description.txt
deleted file mode 100644
index 7eceb32..0000000
--- a/go-back-with-backspace/description.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-Re-enables the backspace key as a back navigation button (except when writing
-text).
diff --git a/go-back-with-backspace/is_editable.js b/go-back-with-backspace/is_editable.js
index 9f5625c..585aa4f 100644
--- a/go-back-with-backspace/is_editable.js
+++ b/go-back-with-backspace/is_editable.js
@@ -14,7 +14,8 @@
                                 nodeType === 'email' ||
                                 nodeType === 'number' ||
                                 nodeType === 'password' ||
-                                nodeType === 'search'))) {
+                                nodeType === 'search' ||
+                                nodeType === 'tel'))) {
     return true;
   }