While I was replacing the icons with the customs I've made. I found these bugs:
1. This is quite a big one. The zoom_reset, zoom_in and zoom_out icons remain as the default zoom icons, and the custom ones for some reason, although named correctly to the line fill buttons. Replacing the line-fill buttons does nothing however.
2. The Water Lock Button cannot be customized and it remains the default icons even when a custom icon has been used.





I.e. instead of zoom buttons you customize the square_fill, line_tool and overwrite_mode

