Adds language West-Central Oromo (gaz)

[DJ-Saidez]

This issue solves #3153

[jiru]

The flag is alright now, thank you!

[jiru]

Actually, the flag still needs some fixing.

1. The ratio is currently 2:1 (1200×600) but it should be 3:2 instead.
2. The SVG height/width should be set to 30×20.

I can make these changes if you want.

[DJ-Saidez]

That would be great, thank you! That way I can see how to do it next time from the data I have here.

[jiru]

@DJ-Saidez The commit above does the necessary changes.

Changing the SVG height and width is just a matter of changing the height and width attributes of the <svg> root tag. It is the default size at which the browser should rasterize the image.

Changing the ratio however is a bit more complex, but the easiest way is to change the viewBox attribute. The viewbox is like a picture frame. Its values consist of the coordinates of a rectangle (top left corner x and y, width and height). After drawing the SVG elements, whatever part of the image that happens to be inside that rectangle will be visible in the final result; everything out of the rectangle is discarded. So, adjusting the viewbox lets you cut off some part of the image, effectively changing the height/width ratio. If you use a SVG editor to open the file, it will let you see the parts outside the view box: