Rename the spreadsheet app

www/common/onlyoffice/app-oo.less

@@ -1,11 +1,11 @@
 @import (reference) "../../customize/src/less2/include/framework.less";
 
 // body
-body.cp-app-oocell, body.cp-app-oodoc, body.cp-app-ooslide {
+body.cp-app-sheet, body.cp-app-oodoc, body.cp-app-ooslide {
     display: flex;
     flex-flow: column;
 
-    &.cp-app-oocell {
+    &.cp-app-sheet {
         .framework_main(
             @bg-color: @colortheme_oocell-bg,
             @warn-color: @colortheme_oocell-warn,

www/common/onlyoffice/inner.js

@@ -154,7 +154,7 @@ define([
                     file.title = title + '.docx' || 'document.docx';
                     file.doc = 'text';
                     break;
-                case 'oocell':
+                case 'sheet':
                     file.type = 'xlsx';
                     file.title = title + '.xlsx' || 'spreadsheet.xlsx';
                     file.doc = 'spreadsheet';
@@ -701,7 +701,7 @@ define([
             }
             var newText;
             switch (type) {
-                case 'oocell' :
+                case 'sheet' :
                     newText = EmptyCell();
                     break;
                 case 'oodoc':