Yes. It should be German eco
nomy.
Other than the fact that it should be capitalized (in German all nouns are capitalized), yes.
Yes, "Hindenburg" should be capitalized as it is a proper noun referring to the German airship LZ 129 Hindenburg.
Only if it's at the beginning of a sentence. Unlike in German, not all nouns are capitalized in English.
Yes, "Fahrenheit" should be capitalized as it is derived from a proper noun, German physicist Daniel Gabriel Fahrenheit, who developed the temperature scale.
The German word "Tag" is capitalized when it starts a sentence or if it is a noun, but it is not typically capitalized when used in the middle of a sentence as a normal word.
It's German Shepherd, both the G and the S are capitalized.
Yes.
Yes. You should always capitalize proper nouns. German Empire is a proper noun because it names a specific place.
Yes you do. German, like Swiss in 'Swiss cheese', would be capitalized no matter where in the sentence it is found. Proper noun rule and proper adjective rule should be checked when in doubt.
No, "quisling" should not be capitalized unless it is the first word in a sentence. It is a common noun derived from the name of a Norwegian politician who collaborated with occupying German forces during World War II.
German is. Submarine is not. "A German submarine surfaced in the North Sea."
Have should be capitalized if it is the beginning of a sentence. Summer should not be capitalized.