Login form language problem - Joomla! Forum - community, help and support

login form language problem:

1. see localized word "Логин" ("username") in "login" field. it's ok.
2. put cursor in field, , field become empty. it's ok.
3. "blur" field (click somewhere else). wait see localized word word "Логин" in "login" field, see "username" in english. bug?
"password" field - same behaviour.

code of form:

code: select all

<p id="form-login-username">
   <input id="modlgn-username" type="text" name="username" class="inputbox" alt="username" size="18" value="Логин" onfocus="if (this.value=='Логин') this.value=''" onblur="if(this.value=='') { this.value='username'; return false; }">
</p>
<p id="form-login-password">
   <input id="modlgn-passwd" type="password" name="password" class="inputbox" size="18" alt="password" value="Пароль" onfocus="if (this.value=='Пароль') this.value=''" onblur="if(this.value=='') { this.value='password'; return false; }">
</p>

all things works fine.
joomla! 2.5.8 en, ru, zh , pt languages.

go module manager, choose search module is being used, click on icon titled edit. in screen "module manager: module search", option "box text" make sure nothing typed in.