Capitalization is the correct spelling.
That is the correct spelling of "capital" (money, uppercase letter, seat of government).
The homophone (sound-alike word) is capitol, which can only be used for one meaning: the building that houses a legislature or similar government authority. Examples: the US Capitol building, the Louisiana Capitol building.
"Thursday" in Spanish is "jueves". It is not capitalized.
The dog breed is capitalized as "Rottweiler".
It is spelled "enero", and is not capitalized.
That is the correct spelling, except capitalized as "Vietnamese".
The temperature scale is Celsius (capitalized, or abbreviated °C).
The capitalized abbreviation (Feb.) stands for the month February.
The name of the Khmer language in Vietnam is capitalized as Puoc.
You have spelled it correctly though it should be capitalized.
février (month names are not capitalized in French)
No. It is not a proper nou n.
That is the correct spelling of the dog breed, capitalized as Pekingese.
I think you are looking for the word "Deutschland". It is always capitalized.