3209

Add zh_TW Traditional Chinese locale

3207

Add option to filter cells with the same style

Also do some reorganization of the filter menu items for better
overview

3206

Do a two-pass for inserting cells

In the first round we populate the new grid only with the original cells,
moving them to their new positions.

In the second round we fill the rest of the grid by moving in the new cell
(if existing) and by copying the styles from neighboring cells.

In the corner case that a row or column is added at the top or at the
left, the code for copying the styles from the appropriate neighbor cell
looks to the next down or right opposed to the other
cases where it looks up or to the left.

For this to work, the neighboring cell must exist. This is why the first
separate round exists.
In a only-one-pass loop otherwise we would have looked to the right or down but the original cells have not been yet moved into the new grid.

3205

Add Vietnamese tutorial translation

Added tutorial-vi.cts to provide a comprehensive Vietnamese guide for TreeSheets users.

3203

Add Vietnamese translation for readme

Add Vietnamese translation for readme (readme-vi.html)

3201

Update Vietnamese translation for new strings

Merged the latest ts.pot template and fully updated both ts.po and ts.mo files.

3199

Better distinguish between catalog codes and final codes list

3198

Reset share pointer for grid after merge with parent

3197

Use user-friendly language labels for language choice

3196

Offer option to use English original strings