Since I've recently seen some inconsistencies and confusion about the grading scale and its equivalency between languages (including me and other Numista users) I believe I have come up with a good and simple idea to solve this problem.
Several things would need to be implemented to fix this issue:
1. I know that multiple grading scales exist across the different languages available on Numista, but I think that at least one scale per language should be standardized on Numista. I believe this would be the hardest part, since finding a scale that has exact equivalency with the English scale can be challenging. However, I think it needs to be done, maybe by creating a poll in each language to determine which scale users of that language prefer.
2. After a definitive scale has been selected for each language, the meaning of each grade in that scale should be included in the guide for its respective language, alongside the meanings of the English scale
(https://en.numista.com/help/what-do-g-vg-f-vf-xf-au-and-unc-mean-81.html).
3. Even if a scale is selected for each language, many collectors may not want to use the scale of their language for many reasons. That's why I think collectors should have the option to choose the scale they prefer, regardless of the language of the page. For example, if I am using the Portuguese version of Numista, I would like the option to change the grading scale without having to change the language of the entire website. This could be implemented, for example, in the account settings page, or by adding a single-option checkbox or a button group directly on the item pages. I suggest placing it between the “Manage my collection” section and the “Add to my collection” section, as shown here. On the Spanish site, for instance, the options could be “Escala en Inglés” and “Escala en Español.”

Another thing that can be implemented on the page is to insert a tooltip (passing the cursor on top of something and seeing a text bow without clicking) to every grade on the scales showing the complete meaning of the abbreviations.
What else should be included?? would you change something?? what do you think about this solution??
(Shout out to davidhs for asking me about this issue)
