While I understand it may be frustrating that your local language translation of Bambu Studio is trash, your underlying statement speaks volumes about the cultural differences between Germany their expectations and other parts of the world. Put simply: The sad state of the language translation has zero to do with pride in workmanship, it’s all about the money. Don’t hate the player, hate the game.
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Cultural differences
My German grandmother taught me the work ethic that a job worth doing is a job worth doing well.
My American grandmother’s philosophy was: do it right, but do it right now and quit wasting time.
I suspect that if I had a Japanese grandmother, based on their culture, it would be: do it right, do it well, and do it with style.
And if I had a Chinese grandmother?.. 
well… you get the picture.
chàbùduō ]
Chinese business philosophy of chàbùduō means “just close enough.” This philosophy makes Western procurement professionals cringe, as vigilance is required to guard against Chinese production standards cutting corners. In short, we know the Chinese are going to cheat and steal; we just have to catch them at it. When companies like Apple make cheating nearly impossible, the Chinese turn to unethical working conditions to compensate, as outlined in 2014 at their largest contractor, Foxconn.
It should also be noted that the philosophy of chàbùduō is as opposite to the German work ethic as possible.
Software testing is a losing game. Most people will not pay extra for ‘hidden’ quality.
When I did software development, I quickly learned that testing and validation are the unseen iceberg of cost in software development. It is far more expensive to test code than to write code. So can you blame software companies for cutting corners? I can, but it doesn’t do any good. 
But most important, it’s hard to justify charging premium for quality software when the average consumer cannot distinguish the difference.
Why should Bambu even bother with getting language support perfect?
Look, the shitty version of Bambu Studio obviously didn’t stop you from buying the printer, did it? Bambu knows this, and combined with chàbùduō, are they wrong? Wasn’t the implementation close enough to get people to hand over their Euros? The bottom line is that English is the Lingua Franca of the 21st century and it makes up greater than 50% of the languages used in tech according to the WWW consortium
Notice that even Chinese(Mandarin) isn’t even on the list. But that may be because the data is censored.
Languages used per Web Page
| Rank | Language | Internet Users | Percentage |
|---|---|---|---|
| 1 | English | 1,186,451,052 | 25.9% |
| 2 | Chinese | 888,453,068 | 19.4% |
| 3 | Spanish | 363,684,593 | 7.9% |
| 4 | Arabic | 237,418,349 | 5.2% |
| 5 | Indonesian | 198,029,815 | 4.3% |
| 6 | Portuguese | 171,750,818 | 3.7% |
| 7 | French | 144,695,288 | 3.3% |
| 8 | Japanese | 118,626,672 | 2.6% |
| 9 | Russian | 116,353,942 | 2.5% |
| 10 | German | 92,525,427 | 2.0% |
| Top 10 Languages | 3,525,027,347 | 76.9% | |
| Others | 1,060,551,371 | 23.1% | |
| Total | 4,585,578,718 | 100% |
Languages used on the Internet.
| Rank | Language | Internet Users | Percentage |
|---|---|---|---|
| 1 | English | 1,186,451,052 | 25.9% |
| 2 | Chinese | 888,453,068 | 19.4% |
| 3 | Spanish | 363,684,593 | 7.9% |
| 4 | Arabic | 237,418,349 | 5.2% |
| 5 | Indonesian/Malaysian | 198,029,815 | 4.3% |
| 6 | Portuguese | 171,750,818 | 3.7% |
| 7 | French | 144,695,288 | 3.3% |
| 8 | Japanese | 118,626,672 | 2.6% |
| 9 | Russian | 116,353,942 | 2.5% |
| 10 | German | 92,525,427 | 2.0% |
| Top 10 Languages | 3,525,027,347 | 76.9% | |
| Others | 1,060,551,371 | 23.1% | |
| Total | 4,585,578,718 | 100% |
I’m not defending Bambu
The bottom line is that the confluence of no-profit vs effort vs greater priorities, and you have a condition that will not change. Companies chase the money for better or worse.
Also, if you don’t like Bambu Studio, have you switched to Orca? It has much better language support I’m told.