theme_bootstrap/style/tinymce-rtl.css

/** Fix TinyMCE editor right to left **/

.dir-rtl .clearlooks2.ie9 .mceAlert .mceMiddle span,
.dir-rtl .clearlooks2 .mceConfirm .mceMiddle span {
    top: 44px;
}

.dir-rtl .o2k7Skin table,
.dir-rtl .o2k7Skin tbody,
.dir-rtl .o2k7Skin a,
.dir-rtl .o2k7Skin img,
.dir-rtl .o2k7Skin tr,
.dir-rtl .o2k7Skin div,
.dir-rtl .o2k7Skin td,
.dir-rtl .o2k7Skin iframe,
.dir-rtl .o2k7Skin span,
.dir-rtl .o2k7Skin *,
.dir-rtl .o2k7Skin .mceText,
.dir-rtl .o2k7Skin .mceListBox .mceText {
    text-align: right;
}