Switch it to English? or at least offering an English version of the documentation. Source code should be in English with no doubt.
Separate Changelog from README. Done
Give hints in README about how to find developer documentation and how to get started. Done
Revisit licensing, GPL would not allow people to sublicense derivate work. Apache license or Mozilla MPL 2.0 are good options. If you need to understanding how different licenses would affect your project go to https://tldrlegal.com/ or http://choosealicense.com/DONE Practico wants to be GPL v2
Today's web development should be mobile first. Mobile should be práctico's priority if you want to get more people interested in using the project
Get a designer as well as a frontend engineer for God's sake :P
Write Milestones in Github for next releases
Write unit tests! not need for full coverage, only happy path.