The source code

    /**
     * Greek (Old Version) Translations by Vagelis
     * 03-June-2007
     */

    Ext.UpdateManager.defaults.indicatorText = 'Öüñôùóç...';

    if(Ext.View){
       Ext.View.prototype.emptyText = "";
    }

    if(Ext.grid.GridPanel){
       Ext.grid.GridPanel.prototype.ddText = "{0} åðéëåãìÝíç(åò) ãñáììÞ(Ýò)";
    }

    if(Ext.TabPanelItem){
       Ext.TabPanelItem.prototype.closeText = "Êëåßóôå áõôÞ ôçí êáñôÝëá";
    }

    if(Ext.form.Field){
       Ext.form.Field.prototype.invalidText = "Ç ôéìÞ óôï ðåäßï äåí åßíáé Ýãêõñç";
    }

    if(Ext.LoadMask){
        Ext.LoadMask.prototype.msg = "Öüñôùóç...";
    }

    Date.monthNames = [
       "ÉáíïõÜñéïò",
       "ÖåâñïõÜñéïò",
       "ÌÜñôéïò",
       "Áðñßëéïò",
       "ÌÜéïò",
       "Éïýíéïò",
       "Éïýëéïò",
       "Áýãïõóôïò",
       "ÓåðôÝìâñéïò",
       "Ïêôþâñéïò",
       "ÍïÝìâñéïò",
       "ÄåêÝìâñéïò"
    ];

    Date.dayNames = [
       "ÊõñéáêÞ",
       "ÄåõôÝñá",
       "Ôñßôç",
       "ÔåôÜñôç",
       "ÐÝìðôç",
       "ÐáñáóêåõÞ",
       "ÓÜââáôï"
    ];

    if(Ext.MessageBox){
       Ext.MessageBox.buttonText = {
          ok     : "ÅíôÜîåé",
          cancel : "Áêýñùóç",
          yes    : "Íáé",
          no     : "¼÷é"
       };
    }

    if(Ext.util.Format){
       Ext.util.Format.date = function(v, format){
          if(!v) return "";
          if(!(v instanceof Date)) v = new Date(Date.parse(v));
          return v.dateFormat(format || "ì/ç/Å");
       };
    }

    if(Ext.DatePicker){
       Ext.apply(Ext.DatePicker.prototype, {
          todayText         : "ÓÞìåñá",
          minText           : "Ç çìåñïìçíßá áõôÞ åßíáé ðñéí ôçí ìéêñüôåñç çìåñïìçíßá",
          maxText           : "Ç çìåñïìçíßá áõôÞ åßíáé ìåôÜ ôçí ìåãáëýôåñç çìåñïìçíßá",
          disabledDaysText  : "",
          disabledDatesText : "",
          monthNames	: Date.monthNames,
          dayNames		: Date.dayNames,
          nextText          : 'Åðüìåíïò ÌÞíáò (Control+Right)',
          prevText          : 'Ðñïçãïýìåíïò ÌÞíáò (Control+Left)',
          monthYearText     : 'ÅðéëÝîôå ÌÞíá (Control+Up/Down ãéá ìåôáêßíçóç óôá Ýôç)',
          todayTip          : "{0} (Spacebar)",
          format            : "ì/ç/Å"
       });
    }

    if(Ext.PagingToolbar){
       Ext.apply(Ext.PagingToolbar.prototype, {
          beforePageText : "Óåëßäá",
          afterPageText  : "áðü {0}",
          firstText      : "Ðñþôç óåëßäá",
          prevText       : "Ðñïçãïýìåíç óåëßäá",
          nextText       : "Åðüìåíç óåëßäá",
          lastText       : "Ôåëåõôáßá óåëßäá",
          refreshText    : "ÁíáíÝùóç",
          displayMsg     : "ÅìöÜíéóç {0} - {1} áðü {2}",
          emptyMsg       : 'Äåí âñÝèçêáí åããñáöÝò ãéá åìöÜíéóç'
       });
    }

    if(Ext.form.TextField){
       Ext.apply(Ext.form.TextField.prototype, {
          minLengthText : "Ôï åëÜ÷éóôï ìÝãåèïò ãéá áõôü ôï ðåäßï åßíáé {0}",
          maxLengthText : "Ôï ìÝãéóôï ìÝãåèïò ãéá áõôü ôï ðåäßï åßíáé {0}",
          blankText     : "Ôï ðåäßï áõôü åßíáé õðï÷ñåùôïêü",
          regexText     : "",
          emptyText     : null
       });
    }

    if(Ext.form.NumberField){
       Ext.apply(Ext.form.NumberField.prototype, {
          minText : "Ç åëÜ÷éóôç ôéìÞ ãéá áõôü ôï ðåäßï åßíáé {0}",
          maxText : "Ç ìÝãéóôç ôéìÞ ãéá áõôü ôï ðåäßï åßíáé {0}",
          nanText : "{0} äåí åßíáé Ýãêõñïò áñéèìüò"
       });
    }

    if(Ext.form.DateField){
       Ext.apply(Ext.form.DateField.prototype, {
          disabledDaysText  : "ÁðåíåñãïðïéçìÝíï",
          disabledDatesText : "ÁðåíåñãïðïéçìÝíï",
          minText           : "Ç çìåñïìçíßá ó' áõôü ôï ðåäßï ðñÝðåé íá åßíáé ìåôÜ áðü {0}",
          maxText           : "Ç çìåñïìçíßá ó' áõôü ôï ðåäßï ðñÝðåé íá åßíáé ðñéí áðü {0}",
          invalidText       : "{0} äåí åßíáé Ýãêõñç çìåñïìçíßá - ðñÝðåé íá åßíáé ôçò ìïñöÞò {1}",
          format            : "ì/ç/Å"
       });
    }

    if(Ext.form.ComboBox){
       Ext.apply(Ext.form.ComboBox.prototype, {
          loadingText       : "Öüñôùóç...",
          valueNotFoundText : undefined
       });
    }

    if(Ext.form.VTypes){
       Ext.apply(Ext.form.VTypes, {
          emailText    : 'Áõôü ôï ðåäßï ðñÝðåé íá åßíáé e-mail address ôçò ìïñöÞò "user@example.com"',
          urlText      : 'Áõôü ôï ðåäßï ðñÝðåé íá åßíáé ìéá äéåýèõíóç URL ôçò ìïñöÞò "http:/'+'/www.example.com"',
          alphaText    : 'Áõôü ôï ðåäßï ðñÝðåé íá ðåñéÝ÷åé ãñÜììáôá êáé _',
          alphanumText : 'Áõôü ôï ðåäßï ðñÝðåé íá ðåñéÝ÷åé ãñÜììáôá, áñéèìïýò êáé _'
       });
    }

    if(Ext.grid.GridView){
       Ext.apply(Ext.grid.GridView.prototype, {
          sortAscText  : "Áýîïõóá Ôáîéíüìçóç",
          sortDescText : "Öèßíïõóá Ôáîéíüìçóç",
          lockText     : "Êëåßäùìá óôÞëçò",
          unlockText   : "Îåêëåßäùìá óôÞëçò",
          columnsText  : "ÓôÞëåò"
       });
    }

    if(Ext.grid.PropertyColumnModel){
       Ext.apply(Ext.grid.PropertyColumnModel.prototype, {
          nameText   : "¼íïìá",
          valueText  : "ÔéìÞ",
          dateFormat : "ì/ç/Å"
       });
    }

    if(Ext.layout.BorderLayout && Ext.layout.BorderLayout.SplitRegion){
       Ext.apply(Ext.layout.BorderLayout.SplitRegion.prototype, {
          splitTip            : "Óýñåôå ãéá áëëáãÞ ìåãÝèïõò.",
          collapsibleSplitTip : "Óýñåôå ãéá áëëáãÞ ìåãÝèïõò. Double click ãéá áðüêñõøç."
       });
    }