#42 Accessibility: Add selectable font DPI for text legends of GUI

[Rafael Linux User]

On the first place, thanks for Spanish translation!!!
However, there is an accessibility issue: Text font size is not synchronized with desktop GUI preferences, so options text legends begin to be difficult to read. In 4K screens is barely readable. However, "LCD" and "log" GUI sections text font size are in sync with desktop GUI.

Please, could fix this issue or add in "GUI tab" a new option to let user change fonts DPI?

Thank you