wordpressに関する質問です。右記URL　http://sistina95.jp/ec/　を制作中でして、「WP Contact Form III」というプラグインを使って、お問い合わせフォームを設置したのですが、なんだか上手くいきません。

>表記を日本語化したい。

これについては、「wp-contact-form-iii/wp-contactform.php」を下記のように書き換えます。

日本語になっている部分があるので分かると思います。このままコピペしてもいいです。

それから、プラグインは「wp-content/plugins/wp-contact-form」にアップロードして下さい。

アップロードした後に必ず管理画面から「オプション」→「Contact Form III」にアクセスして初期設定を行なって下さい。

これを行なうことで多分レイアウトのズレは直ると思います。

<?php
/*
Plugin Name: WP Contact Form III
Plugin URI: http://kzkw.net/wp/
Description: WP Contact Form III is a simple drop in form for users to contact you. It can be implemented on a page or a post. Go to Options -> ContactForm III to configure. Challenge (antispam) mod by <a href="http://www.douglaskarr.com">Doug Karr</a>. Original script by <a href="http://ryanduff.net">Ryan Duff</a> 
Author: Kristin K. Wangen
Author URI: http://kzkw.net/
Version: 1.4
*/

/*  Copyleft 2007  Kristin K. Wangen 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/



if(function_exists('load_betterlang_textdomain')) { load_betterlang_textdomain('cfiii'); }
else { load_plugin_textdomain('cfiii', $path = 'wp-content/plugins/wp-contact-form/languages');
} 


/* Declare strings that change depending on input. This also resets them so errors clear on resubmission. */

$wpcf_strings = array('name' => '<input class="contactright" type="text" name="wpcf_your_name" id="wpcf_your_name" size="30" maxlength="50" value="' . 	$_POST['wpcf_your_name'] . '" />','email' => '<input class="contactright" type="text" name="wpcf_email" id="wpcf_email" size="30" maxlength="50" value="' . $_POST['wpcf_email'] . '" />','subject' => '<input class="contactright" type="text" name="wpcf_subject" id="wpcf_subject" size="30" maxlength="50" value="' .$_POST['wpcf_subject'] . '" />','response' => '<input class="contactright" type="text" name="wpcf_response" id="wpcf_response" size="30" maxlength="50" value="' . $_POST['wpcf_response'] . '" />','msg' => '<textarea class="contactright" name="wpcf_msg" id="wpcf_msg" cols="35" rows="8" >' . $_POST['wpcf_msg'] . '</textarea>','error' => '',);



/*
This shows the quicktag on the write pages
Based off Buttonsnap Template
http://redalt.com/downloads
*/

if(get_option('wpcf_show_quicktag') == true) {
	include('buttonsnap.php');
	add_action('init', 'wpcf_button_init');
	add_action('marker_css', 'wpcf_marker_css');


	function wpcf_button_init() {
		$wpcf_button_url = buttonsnap_dirname(__FILE__) . '/wpcf_button.png';
		buttonsnap_textbutton($wpcf_button_url, __('Contact Form', 'cfiii'), '[contactform]');
		buttonsnap_register_marker('contact form', 'wpcf_marker');
	}

	function wpcf_marker_css() {
		$wpcf_marker_url = buttonsnap_dirname(__FILE__) . '/wpcf_marker.gif';
		echo "
			.wpcf_marker {
					display: block;
					height: 15px;
					width: 155px
					margin-top: 5px;
					background-image: url({$wpcf_marker_url});
					background-repeat: no-repeat;
					background-position: center;
			}
		";
	}
}


function wpcf_is_malicious($input) {
	$is_malicious = false;
	$bad_inputs = array("\r", "\n", "mime-version", "content-type", "bcc:", "cc:", "to:");
	foreach($bad_inputs as $bad_input) {
		if(strpos(strtolower($input), strtolower($bad_input)) !== false) {
			$is_malicious = true; break;
		}
	}
	return $is_malicious;
}

function wpcf_is_challenge($input) {
	$is_challenge = false;
	$answer = get_option('wpcf_answer');
	$answer = stripslashes(trim($answer));
	if($input == $answer) {
		$is_challenge = true;
	}
	return $is_challenge;
}



/* This function checks for errors on input and changes $wpcf_strings if there are any errors. Shortcircuits if there has not been a submission */

function wpcf_check_input()
{
	if(!(isset($_POST['wpcf_stage']))) {return false;} // Shortcircuit.
	$_POST['wpcf_your_name'] = stripslashes(trim($_POST['wpcf_your_name']));
	$_POST['wpcf_email'] = stripslashes(trim($_POST['wpcf_email']));
	$_POST['wpcf_response'] = stripslashes(trim($_POST['wpcf_response']));
	$_POST['wpcf_website'] = stripslashes(trim($_POST['wpcf_website']));
    	$_POST['wpcf_subject'] = stripslashes(trim($_POST['wpcf_subject']));
	$_POST['wpcf_msg'] = stripslashes(trim($_POST['wpcf_msg']));

	global $wpcf_strings;
	$ok = true;

	if(empty($_POST['wpcf_your_name']))
	{
		$ok = false; $reason = 'empty';
		$wpcf_strings['name'] = '<input type="text" name="wpcf_your_name" id="wpcf_your_name" size="30" maxlength="50" value="' . $_POST['wpcf_your_name'] . ' (' . __('required', 'cfiii') . ')" class="contacterror contactright" />' ;
	}

    if(!is_email($_POST['wpcf_email']))
    {
	    $ok = false; $reason = 'empty';
	    $wpcf_strings['email'] = '<input type="text" name="wpcf_email" id="wpcf_email" size="30" maxlength="50" value="' . $_POST['wpcf_email'] . ' (' . __('required', 'cfiii') . ')" class="contacterror contactright" />';
	}

    if(empty($_POST['wpcf_response']))
    {
	    $ok = false; $reason = 'empty';
	    $wpcf_strings['response'] = '<input type="text" name="wpcf_response" id="wpcf_response" size="30" maxlength="50" value="' . $_POST['wpcf_response'] . ' (' . __('required', 'cfiii') . ')" class="contacterror contactright" />';
	}  

	if (!wpcf_is_challenge($_POST['wpcf_response'])) {
	    $ok = false; $reason = 'wrong';
	    $wpcf_strings['response'] = '<input type="text" name="wpcf_response" id="wpcf_response" size="30" maxlength="50" value="' . $_POST['wpcf_response'] . ' (' . __('required', 'cfiii') . ')" class="contacterror contactright" />';
	}

    if(empty($_POST['wpcf_subject']))
    {
        $ok = false; $reason = 'empty';
        $wpcf_strings['subject'] = '<input type="text" name="wpcf_subject" id="wpcf_subject" size="30" maxlength="50" value="' . $_POST['wpcf_subject'] . ' (' . __('required', 'cfiii') . ')" class="contacterror  contactright" />';
    }

   if(empty($_POST['wpcf_msg']))
    {
	    $ok = false; $reason = 'empty';
	    $wpcf_strings['msg'] = '<textarea name="wpcf_msg" id="wpcf_message" cols="35" rows="8" class="contacterror contactright">' . $_POST['wpcf_msg'] . ' (' . __('required', 'cfiii') . ')</textarea>';
	}

	if(wpcf_is_malicious($_POST['wpcf_your_name']) || wpcf_is_malicious($_POST['wpcf_email'])) {
		$ok = false; $reason = 'malicious';
	}

	if($ok == true)
	{
		return true;
	}
	else {
		if($reason == 'malicious') {
			$wpcf_strings['error'] = "<em>".__('You can not use any of the following in the Name or Email fields: a linebreak, or the phrases \'mime-version\', \'content-type\', \'cc:\' \'bcc:\'or \'to:\'.','cfiii')."</em>";
		} elseif($reason == 'empty') {
			$wpcf_strings['error'] = '<em>' . stripslashes(get_option('wpcf_error_msg')) . '</em>';
		} elseif($reason == 'wrong') {
			$wpcf_strings['error'] = "<em>".__('You answered the challenge question incorrectly.', 'cfiii')."</em>";
		}
		return false;
	}
}


/*Wrapper function which calls the form.*/
function wpcf_callback( $content )
{
	global $wpcf_strings;
	wpautop($content, 0);
	/* Run the input check. */

		if(! preg_match('|[contactform]|', $content)) {
		return $content;
		}
    if(wpcf_check_input()) // If the input check returns true (ie. there has been a submission & input is ok)
    {
            $recipient = get_option('wpcf_email');
            $subject     = $_POST['wpcf_subject'];
						$success_msg = get_option('wpcf_success_msg');
						$success_msg = stripslashes($success_msg);

            $name = $_POST['wpcf_your_name'];
            $email = $_POST['wpcf_email'];
            $website = $_POST['wpcf_website'];
            $msg = $_POST['wpcf_msg'];

      			$headers = "MIME-Version: 1.0\n";
						$headers .= "From: $name <$email>\n";
						$headers .= "Content-Type: text/plain; charset=\"" . get_settings('blog_charset') . "\"\n";

            $fullmsg = "$name ".__('wrote:','cfiii')."\n";
            $fullmsg .= wordwrap($msg, 80, "\n") . "\n\n";
            $fullmsg .= "".__('Website:','cfiii')." " . $website . "\n";
            $fullmsg .= "".__('IP:','cfiii')."" . getip();

            mail($recipient, $subject, $fullmsg, $headers);

           $results = '<strong>' . $success_msg . '</strong>';
            echo $results;
    }
    else // Else show the form. If there are errors the strings will have updated during running the inputcheck.
    {

		$question = stripslashes(get_option('wpcf_question'));
        $form = trim('<form id="contactform" action="' . get_permalink() . '" method="post">
<fieldset><legend> '.__('Contact Form','cfiii').'</legend><div><em>* '.__('必須事項','cfiii').'</em>' . $wpcf_strings['error'] . '</div>
<label class="contactleft" for="wpcf_your_name">' . __('名前: ', 'cfiii') . '*</label>' . $wpcf_strings['name']  . ' 
<label class="contactleft" for="wpcf_email">' . __('メールアドレス:', 'cfiii') . '*</label>' . $wpcf_strings['email'] . ' 
<label class="contactleft" for="wpcf_website">' . __('ホームページ:', 'cfiii') . '</label>
<input class="contactright" type="text" name="wpcf_website" id="wpcf_website" size="30" maxlength="100" value="' . $_POST['wpcf_website'] . '" /> 
<label class="contactleft" for="wpcf_subject">' . __('題名:', 'cfiii') . '*</label>' . $wpcf_strings['subject'] . ' 
<label class="contactleft" for="wpcf_msg">' . __('本文: ', 'cfiii') . '*</label>' . $wpcf_strings['msg'] . ' 
<label class="contactleft" for="wpcf_response">' . __($question, 'cfiii') . '*</label>' . $wpcf_strings['response'] . ' 
<input class="contactright" type="submit" name="Submit" value="' . __('送信', 'cfiii') . '" id="contactsubmit" />
<input type="hidden" name="wpcf_stage" value="process" />
</fieldset></form>');

return str_replace('[contactform]', $form, $content);

   }
}

/*Can't use WP's function here, so lets use our own*/
function getip()
{
	if (isset($_SERVER))
	{
 		if (isset($_SERVER["HTTP_X_FORWARDED_FOR"]))
 		{
  			$ip_addr = $_SERVER["HTTP_X_FORWARDED_FOR"];
 		}
 		elseif (isset($_SERVER["HTTP_CLIENT_IP"]))
 		{
  			$ip_addr = $_SERVER["HTTP_CLIENT_IP"];
 		}
 		else
 		{
 			$ip_addr = $_SERVER["REMOTE_ADDR"];
 		}
	}
	else
	{
 		if ( getenv( 'HTTP_X_FORWARDED_FOR' ) )
 		{
  			$ip_addr = getenv( 'HTTP_X_FORWARDED_FOR' );
 		}
 		elseif ( getenv( 'HTTP_CLIENT_IP' ) )
 		{
  			$ip_addr = getenv( 'HTTP_CLIENT_IP' );
 		}
 		else
 		{
  			$ip_addr = getenv( 'REMOTE_ADDR' );
 		}
	}
return $ip_addr;
}

/*CSS Styling*/
function wpcf_css()
	{
	?>
<link rel="stylesheet" type="text/css" media="screen" href="<?php bloginfo('wpurl'); ?>/wp-content/plugins/wp-contact-form/contactform.css" />

<?php
	}
function wpcf_add_options_page()
	{
		add_options_page('Contact Form Options', 'Contact Form III', 'manage_options', 'wp-contact-form/options-contactform.php');
	}

/* Action calls for all functions */

//if(get_option('wpcf_show_quicktag') == true) {add_action('admin_footer', 'wpcf_add_quicktag');}

add_action('admin_head', 'wpcf_add_options_page');
add_filter('wp_head', 'wpcf_css');
add_filter('the_content', 'wpcf_callback', 7);
?>

>これは、wp-content/plugins/wp-contact-formという名前に変えればよい、ということでしょうか？

その通りです。

プラグイン自身がフォルダ名を決め打ちしているのでそれ以外の名前だと設定画面に入れませんし、そのフォルダに入っているcssファイルにもアクセスできずにレイアウトが乱れるのです。

以降、もし必要があればコメント欄を開けてもらえればそちらの方でフォローします。