Some languages have institutions overseeing their development and doing top-down reforms. For example Polish has https://en.wikipedia.org/wiki/Polish_Language_

Some languages have institutions overseeing their development and doing top-down reforms. For example Polish has https://en.wikipedia.org/wiki/Polish_Language_Council https://en.wikipedia.org/wiki/Polish_Language_Council and it had 2 reforms in last 100 years.