diff --git a/app.html b/app.html
index 651bb77..70be537 100644
--- a/app.html
+++ b/app.html
@@ -229,343 +229,6 @@
     <textarea></textarea>
 </template>
 
-<script ui>
-const _s = (ss, ...pp)=> ss.map((s,i)=> s + (pp[i]||'')).join('')
-,     _a = iterable=> iterable.length > 1 ? iterable : iterable[0]
-,     Q = (ss, ...pp)=> [...document.querySelectorAll( _s(ss, ...pp))]
-,     T = document.createElement('template')
-,     DOM = (ss, ...pp)=> ( T.innerHTML = _s(ss, ...pp), document.adoptNode(T.content).childNodes )
-,     $ = (ss, ...pp)=> _a( ~_s(ss, ...pp).indexOf('<') ? DOM(ss, ...pp) : Q(ss, ...pp) )
-
-,     notify = (html,attrs)=> $`body`.add( $`<ui-toast ${attrs ? attrs : ''}>${html}</ui-toast>` )
-,     bubbleOn = el=> e=> el.dispatchEvent( new ErrorEvent('Error',{bubbles:true, error:e}) )
-,     pulse = color=> (document.body.style.background = color) && setTimeout(o=> document.body.style.background = 'lightgrey', 1000)
-
-Node.prototype.add = function( ...els )
-{
-    this.append( ...els )
-    return _a( els )
-}
-Node.prototype.$ = function(ss, ...pp)
-{
-    return _a(
-        ~_s(ss, ...pp).indexOf('<')
-            ? this.add(...DOM(ss, ...pp))
-            : [...this.querySelectorAll( _s(ss, ...pp))]
-    )
-}
-Node.prototype.on = function(ss, ...pp)
-{
-    let types = _s( [].concat(ss), ...pp ).split(/[,\s]/)
-    return (...args)=> ( types.map( type=> this.addEventListener(type,...args)), this )
-}
-
-class UI extends HTMLElement {
-    static get is(){ return 'ui' + this.name.replace(/[A-Z]/g, L=> '-'+L.toLocaleLowerCase()) }
-    constructor()
-    {
-        super()
-        let tpl = $`template[${this.constructor.is}]`
-        tpl && this.attachShadow({mode: 'open'})
-            .appendChild( tpl.content.cloneNode(true) )
-    }
-}
-
-class Toast extends UI {
-    static get duration(){ return this._duration || 10000 }
-    static set duration( v ){ this._duration = v }
-    connectedCallback()
-    {
-        setTimeout( toast=> toast.remove(), this.getAttribute('duration') || Toast.duration, this )
-    }
-}
-
-
-class Data extends UI {
-    static get observedAttributes(){ return ['bin','uint','utf8','base64','frame'] }
-    connectedCallback()
-    {
-        // this.observer = new MutationObserver(
-            // changes=> console.log(changes.filter(m=>~['bin','255','utf8','base64','object'].indexOf(m.attributeName)) )
-        // )
-        // .observe( this, { attributes: true } )
-        this.shadowRoot.append(
-            ...Data.observedAttributes
-                .map( type=> $`<button ${type}>${type}</button>`
-                                .on`click`( e=> this.type = e.target.innerText )
-                )
-            )
-        // this.shadowRoot.$`button`.map( button=> button.onclick = e=> this.type = e.target.innerText )
-        this.shadowRoot.$`textarea`.on`change`( e=> this._value = CC[this.type+'2buffer'](e.target.value) )
-    }
-
-    get type(){ return this.attributes[0].name }
-    set type( v ){
-        if( this.type == v ) return;
-        [...this.attributes].map( o=> o.ownerElement.removeAttributeNode(o) )
-        this.setAttribute( v, '' )
-    }
-
-    get value(){ return this._value }
-    set value( v ){ this._value = v; this.shadowRoot.$`textarea`.value = CC['buffer2'+this.type](v) }
-
-    attributeChangedCallback(name, oldValue, newValue)
-    {
-        if( this.shadowRoot.$`textarea`.value )
-            this.shadowRoot.$`textarea`.value = CC['buffer2'+this.type]( this._value )
-    }
-}
-
-
-;[ Toast, Data ]
-    .map( klass=> customElements.define(klass.is, klass) )
-
-// document.body.addEventListener('Error', e=> pulse('red') && (notify(e.error.message).style.color = 'red') )
-$`body`.on`Error`( e=> 
-    pulse('red') && notify(
-        `<b>${e.error.code||''} ${e.error.name}</b>: ${e.error.message}`
-    ,   'error')
-)
-
-// lang support
-Object.defineProperty( window, 'lang', {
-    get: ()=> $`:root`.getAttribute('lang')
-,   set: v=> $`:root`.setAttribute( 'lang', v )
-})
-
-new MutationObserver( changes=>
-    changes.map( ch=> ch.attributeName == 'lang' && $`:root`.dispatchEvent(new Event('lang')) )
-)
-.observe( $`:root`, { attributes: true } )
-
-const lgAttReg = new RegExp( '^('+$`style[lang]`.attributes.lang.value.split(',').join('|')+'):')
-$`:root`.on`lang`( e=> 
-    $`*`.map( node=> [...node.attributes]
-                            .filter( att=> lgAttReg.test(att.name) )
-    )
-    .filter( arr=> arr.length )
-    .map( atts=> atts.filter(att=>new RegExp('^'+lang+':').test(att.name))
-                    .map(att=> att.ownerElement.setAttribute(att.name.split(':').pop(),att.value) ))
-)
-// compile lang styles
-Q`style[lang]`.map( style=> 
-    style.innerHTML = [...style.sheet.rules]
-        .map( r=> style.attributes.lang.value.split(',')
-                        .map( lg=> r.cssText.replace(/_lang_/g, lg) )
-                        .join('\n')
-        )
-        .join('\n')
-)
-lang = navigator.language
-</script>
-
-<script app>
-const algo = { name: "AES-GCM", iv: Uint8Array.from([120,1,248,135,62,71,87,156,92,67,155,37]) }
-,     parseAlgo = str=> ({ name: str.split(' ')[0], iv: Uint8Array.from(str.split(' ').slice(1)) })
-,     algos = [ "AES-GCM 120 1 248 135 62 71 87 156 92 67 155 37", 'AES-CBC' ]
-//,     algo = parseAlgo(algos[0])
-,     $pass = $`pass input`
-,     $text = $`ui-data`
-,     $filename = $`[filename]`
-
-opener && document.documentElement.classtList.add('parented')
-// sel=opener.document.getSelection().type=='None'||'Range'
-
-const getParentSelection = ()=> opener && opener.document.getSelection().toString()
-const setParentSelection = str=> opener && opener.document.activeElement.setRangeText( str )
-
-let key
-const ivLen = 16 // the IV is always 16 bytes
-
-$pass.onchange = async e=>
-    key = await crypto.subtle.importKey(
-        'raw'
-    ,   await crypto.subtle.digest( 'SHA-256', new TextEncoder().encode($pass.value) )
-    ,   algo, false, ['encrypt','decrypt']
-    )
-
-
-const joinIvAndData = (iv, data)=> {
-    var buf = new Uint8Array(iv.length + data.length)
-    Array.prototype.forEach.call(iv, (byte, i)=> buf[i] = byte )
-    Array.prototype.forEach.call(data, (byte, i)=> buf[ivLen + i] = byte )
-    return buf
-}
-
-const separateIvFromData = buf=> Array.prototype.reduce.call( new Uint8Array(buf),
-    ( res, byte, i )=>
-        i < ivLen 
-            ? ( res.iv[i] = byte, res )
-            : ( res.data[i - ivLen] = byte, res )
-,   { iv: new Uint8Array(ivLen), data: new Uint8Array(buf.byteLength - ivLen) } )
-
-
-const encrypt = ()=> {
-    return crypto.subtle.digest( 'SHA-256', new TextEncoder().encode($pass.value) )
-        .then( pwHash=> crypto.subtle.importKey('raw', pwHash, algo, false, ['encrypt']) )
-        .then( key=> crypto.subtle.encrypt(algo, key, new TextEncoder().encode($text.value)) )
-        //.then( ctBuffer=> $text.value = new Uint8Array(ctBuffer).toString().replace(/,/g,'O') )
-        .then( ctBuffer=> $text.value = uint2String( new Uint8Array(ctBuffer) ) )
-        //.then( ctBuffer=> $text.value = new TextDecoder().decode(new Uint8Array(ctBuffer)) )
-        
-        //.catch( e=> pulse('red') )
-}
-const encrypt2 = str=> 
-    crypto.subtle.encrypt( algo, key, new TextEncoder().encode(str) )
-        //.then( ctBuffer=> $text.value = new Uint8Array(ctBuffer).toString().replace(/,/g,'O') )
-        // .then( ctBuffer=> uint2String(new Uint8Array(ctBuffer)) )
-        .then( ctBuffer=> $text.value = new TextDecoder().decode(new Uint8Array(ctBuffer)) )
-        
-        //.catch( e=> pulse('red') )
-
-const encrypt3 = ( data, iv = crypto.getRandomValues(new Uint8Array(ivLen)) )=> 
-    crypto.subtle.encrypt( {name: 'AES-GCM', iv}, key, data )
-        // .then( encrypted=> bufferToBinaryString( joinIvAndData(iv, new Uint8Array(encrypted)).buffer ) )
-        .then( encrypted=> joinIvAndData(iv, new Uint8Array(encrypted)).buffer )
-            // var base64 = Unibabel.bufferToBase64(ciphered)
-            // .replace(/\-/g, '+')
-            // .replace(/_/g, '\/')
-            // ;
-
-            // while (base64.length % 4) {
-            // base64 += '=';
-            // }
-            // return base64;
-        // })
-
-
-const decrypt = ()=> {
-    return crypto.subtle.digest( 'SHA-256', new TextEncoder().encode($pass.value) )
-        .then( pwHash=> crypto.subtle.importKey('raw', pwHash, algo, false, ['decrypt']) )
-        //.then( key=> crypto.subtle.decrypt(algo, key, Uint8Array.from($text.value.split('O').map(Number)).buffer ) 	)
-        .then( key=> crypto.subtle.decrypt(algo, key, string2Uint($text.value).buffer ) 	)
-        //.then( key=> crypto.subtle.decrypt(algo, key, new TextEncoder().encode($text.value).buffer ) 	)
-        .then( ptBuffer=> $text.value = new TextDecoder().decode(ptBuffer) )
-        
-        //.catch( e=> pulse('red') )
-}
-
-const decrypt3 = buf=> {
-  let { iv, data } = separateIvFromData( buf )
-  
-  return crypto.subtle.decrypt(
-    { name: 'AES-GCM', iv }
-  , key
-  , data
-  )/*.then(function (decrypted) {
-    var base64 = bufferToUtf8(new Uint8Array(decrypted))
-    //   .replace(/\-/g, '+')
-    //   .replace(/_/g, '\/')
-    //   ;
-
-    // while (base64.length % 4) {
-    //   base64 += '=';
-    // }
-    return base64
-  })*/
-}
-
-var lastSaved
-const save = ( content, filename )=> {
-    let link = document.createElement('a')
-    link.setAttribute( 'download', filename )
-    // If we are replacing a previously generated file we need to
-    // manually revoke the object URL to avoid memory leaks.
-    lastSaved && URL.revokeObjectURL( lastSaved )
-    link.href = lastSaved = URL.createObjectURL( new Blob([content], {type: 'text/plain'}) )
-    //link.href = makeTextFile( content )
-    document.body.appendChild( link )
-
-    // wait for the link to be added to the document
-    window.requestAnimationFrame( e=> {
-        link.dispatchEvent( new MouseEvent('click') )
-        document.body.removeChild( link )
-    })
-}
-
-const read = file=> new Promise( (ok,ko)=> {
-    let r = new FileReader()
-    r.onload = e=> ok( r.result )
-    r.onerror = e=> ko()
-    r.readAsText( file )
-})
-
-
-var textFile
-const makeTextFile = text=> {
-    
-    textFile && URL.revokeObjectURL(textFile)
-    textFile = URL.createObjectURL( new Blob([text], {type: 'text/plain'}) )
-
-    // returns a URL you can use as a href
-    return textFile
-}
-
-
-const save2 = (file, content, type)=> window.open( "data:application/octet-stream," + encodeURIComponent(content), file )
-
-//// conversion ////
-
-const uint2string = uintArray=> String.fromCharCode.apply( null, uintArray )
-
-const string2uint = string=> new Uint8Array(
-    btoa( string ).split('')
-        .map( l=>l.charCodeAt(0) )
-)
-
-const buffer2bin = buf=> Array.prototype.map.call( new Uint8Array(buf), ch=> String.fromCharCode(ch) ).join('')
-
-const buffer2base64 = arr=> btoa( buffer2bin(arr) )
-
-const bin2buffer = binstr=> new Uint8Array(
-    Array.prototype.map.call( new Uint8Array( binstr.length ), (ch, i)=> binstr.charCodeAt(i) )
-)
-
-const base642buffer = base64=> bin2buffer( atob(base64) )
-
-const bin2utf8 = binstr=> decodeURIComponent(
-	binstr.replace(/./g, c=> 
-		`%${c.charCodeAt(0) < 16 ? '0' : ''}${c.charCodeAt(0).toString(16).toUpperCase()}`
-	)
-)
-
-const buffer2utf8 = buf=> bin2utf8( buffer2bin(buf) )
-
-const utf82bin = str=> encodeURIComponent(str)
-  // replaces any uri escape sequence, such as %0A,
-  // with binary escape, such as 0x0A
-  .replace(/%([0-9A-F]{2})/g, (s,$1)=> String.fromCharCode(parseInt($1, 16)) )
-
-const utf82buffer = str=> bin2buffer(utf82bin(str))
-
-
-const CC = {
-    uint2string
-,   string2uint
-,   buffer2bin
-,   buffer2base64
-,   buffer2utf8
-,   bin2buffer
-,   base642buffer
-,   bin2utf8
-,   utf82bin
-,   utf82buffer
-}
-
-/*const uintToString = (uintArray)=> {
-    var encodedString = String.fromCharCode.apply(null, uintArray),
-        decodedString = decodeURIComponent(escape(encodedString));
-    return decodedString;
-}
-function stringToUint(string) {
-    var string = btoa(unescape(encodeURIComponent(string))),
-        charList = string.split(''),
-        uintArray = [];
-    for (var i = 0; i < charList.length; i++) {
-        uintArray.push(charList[i].charCodeAt(0));
-    }
-    return new Uint8Array(uintArray);
-}
-
-*/
-</script>
\ No newline at end of file
+<script ui src="./ui.js"></script>
+<script lang src="./lang.js" lang="eo,en,fr"></script>
+<script app src="./app.js"></script>