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Installing PO translate without plugin system...

Download the zip and upload following the zip instructure..

open root/admin.php look for around line 4944

case 'apps':
      // check admin|moderator permission
      if ($user->_is_moderator) {
        _error(__('System Message'), __("You don't have the right permission to access this"));
      }

      // page header
      page_header($control_panel['title'] . " › " . __("Apps"));
      break;

After that add 

case 'translate':
    require('modules/translate/admin.php');
    // check admin|moderator permission
    if ($user->_is_moderator) {
      _error(__('System Message'), __("You don't have the right permission to access this"));
    }
    // page header
    page_header($control_panel['title'] . " › " . __("Manage translate"));
    break;

Visit /admincp/translate

Install the admin menu

open content/themes/default/admin.tpl and look for

Languages menu and after that languages comment add

{include file='translate/adminmenu_admin.tpl'}

If you want to install the language picker that shows on all site pages open content/themes/default/templates/head.tpl

And at the very end, after the closing head tag, add 

 
{include file='translate/header_after.tpl'}

Watch this video to see it in action 

Add this to your language files to translate the PO Translate Add-on

msgid "PO Translate"
msgstr "Traducir PO"

msgid "Per page"
msgstr "Por página"

msgid "Locale"
msgstr "Idioma"

msgid "Load PO"
msgstr "Cargar PO"

msgid "Add New Translation"
msgstr "Agregar nueva traducción"

msgid "Auto-apply browser translation to textareas"
msgstr "Aplicar automáticamente la traducción del navegador a las áreas de texto"

msgid "Enable Google Translate on this page, then check this box to automatically apply translations to empty fields."
msgstr "Habilite Google Translate en esta página, luego marque esta casilla para aplicar automáticamente las traducciones a los campos vacíos."

msgid "Showing entries"
msgstr "Mostrando entradas"

msgid "Filter by msgid or msgstr"
msgstr "Filtrar por msgid o msgstr"

msgid "Original text (msgid)"
msgstr "Texto original (msgstr)"

msgid "Translation (msgstr)"
msgstr "Traducción (msgstr)"

msgid "Save Current Page"
msgstr "Guardar página actual"

msgid "Editing"
msgstr "Editando"

msgid "Checked path"
msgstr "Revisar Ruta"

msgid "with"
msgstr "estafa"

msgid "entries"
msgstr "entradas"

msgid "PO file not found or unreadable"
msgstr "Archivo PO no encontrado o ilegible"

msgid "Filter by msgid or msgstr..."
msgstr "Filtrar por msgid o msgstr..."

msgid "Translate Picker"
msgstr "Selector de traducción"

msgid "(from .po)"
msgstr "(de .po)"

msgid "Copy"
msgstr "Copiar"

msgid "Use to add to your html code"
msgstr "Úselo para agregar a su código html"

msgid "Use to add in admincp language"
msgstr "Úselo para agregar en el idioma admincp"

msgid "No exact match in .po; using clicked text"
msgstr "No hay coincidencia exacta en .po; se utiliza el texto en el que se hizo clic"

msgid "Makes it easier to add language to your work"
msgstr "Facilita agregar idioma a tu trabajo"

msgid "Pick Text"
msgstr "Seleccionar texto"

msgid "Match found in .po"
msgstr "Coincidencia encontrada en .po"

msgid "Hover & click any text"
msgstr "Pasa el mouse y haz clic en cualquier texto"