You get these as a warning, if you have got a deficit in one or more courses (4- or worse, that is probably a D- in the USA) you might not successfully end your grade and you would have to repeat it. So students get their blue letters at the time they get their "Halbjahreszeugnis" (I think it is like the American repord card). This way students still have the chance to improve their performance and the school cannot be blamed for not warning the students that they might fail to succeed the grade.
But don´t ask me why they are called blue letters, the ones I got in school weren´t blue.
The word "blue" in German has no meaning. However, the translation of the word "blue" into German is "blau."
It means blue in German
sky blue
Blue means drunk.
In German "G" means "G"
school equipment or school matters
It literally means unsatisfactory but it is the worst grade that you can get in German school.
If you have natural blond brown ginger hair, blue eyes and height and thin cheekbones, it does not mean you are part German, but you could be.
Eerne is not a German word. You probably mean in der schule lerne ich which translates as I learn in school.
German has no umlaut on the letter e. Umlauts however differentiate pronunciations.
If you mean aunt as in 'the wife of an uncle', then in German it would be "Tante". Remember that all German nouns are always spelt with a capital letter!
Glum, blue, down