Before you have not talked to a single category but at least seven categories that did not match the icons......
Not all the categories you find in Spain can match the icons to those of the "original" speedcam.zip file that you find here.

Inkscape? I tried it for 20 minutes, but when I saw how vectorialized the images I left it immediately ......
I've already told you that it's not easy at all make svg icons and replace them with the files in speedcam.zip...... then you must also change the bmp icons in your resolution folder...... the voice.zip file and the lang.zip file......