I also use the resolution 2560x1440 and had the same issue, but I found a solution. I edited the following lines in the file "Views\ControlsView.xaml":
Line 37: Change column width to "165".
<ColumnDefinition Width="165" />
Line 40, 41, 42, 43: Add MinWidth="120" to all button tags.
<Button Name="PlayGame" Content="{Binding PlayLabel}" IsEnabled="{Binding PlayGameEnabled}" Style="{StaticResource ButtonStyle}" MinWidth="120" />
<Button Name="Configure" Content="{Binding ConfigureLabel}" IsEnabled="{Binding ConfigureEnabled}" Style="{StaticResource ButtonStyle}" MinWidth="120" />
<Button Name="Edit" Content="{Binding EditLabel}" IsEnabled="{Binding EditEnabled}" Style="{StaticResource ButtonStyle}" MinWidth="120" />
<Button Name="Delete" Content="{Binding DeleteLabel}" IsEnabled="{Binding DeleteEnabled}" Style="{StaticResource ButtonStyle}" MinWidth="120" />
Line 318: Change MinWidth to "120".
<Button Name="Add" Content="{Binding AddLabel}" Style="{StaticResource ButtonStyle}" Grid.Column="6" HorizontalAlignment="Right" Margin="10,10,10,10" MinWidth="120" />
Now all button texts are displayed correctly.
I hope this helps!