At this point, the ribbon and the context menu are not localized out of the box and the users need to change the strings manually.
Implement functionality to rotate the text in a cell.
Provide the ability to work with images in headers/footers of a worksheet. Note that large images put in headers are visualized as watermarks on printing/exporting to PDF.
I think it would be really cool to include a search bar in the filter window, as implemented in Excel (Please find attached a screenshot for demonstration). This is a very useful functionality, as there may be too many options to choose from is the filter is added to subject ID, which could result in thousands IDs.
Add support for preserving and exporting the macros in a macro-enabled workbook. Macros are pieces of code written in Visual Basic for Applications (VBA) which are used to automate repetitive tasks in excel. The macros are part of the excel file. When a file contains a macro its extension becomes xlsm. Spreadsheet should be able to import and export xlsm files and edit the macros in them.
Currently the following text filters are not supported in the model, filtering popup and Custom Filter dialog: - begins with - does not begin with - ends with - does not end with - contains - does not contain. All of these are supported in MS Excel.
Add support for import and export of Excel Template files (XLTS) file format.