TASK DEFINITION: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
PROBLEM: Question: I need to find a shortened format (abbreviation) for the words "look at" (to be used when referring people to another website). For example: Example given e.g 
Answer: The latinate abbreviation (corresponding to "e.g." for exempli gratia) is "q.v." for quod vide = "which see", to direct someone elsewhere for further information. If it's an abbreviation you want, that's the perfect fit. As other answers point out, however, "see" is even shorter, and provides more clarity. While "q.v." is common enough in some academic writing, it's not exactly common parlance. My own sense is that "cf." should not be used here (even though it is in the "accepted" answer): it has a real meaning, and that meaning is "compare". From the question, that isn't the intended meaning. It is properly used in situations to contrast one thing with another (see also the advice from the the APA blog on the use of "cf.").

SOLUTION: no

PROBLEM: Question: I frequently encounter phrases like this: "It allows to apply these features to customisable sets of fonts". My question is whether this is proper English or not? In my mind, "it allows the application of ..." or "it allows one to apply ..." sound much better. I suspect that this is a Germanism (that would explain why I hear it so often), but it would be nice to know for sure. 
Answer: Allow somebody to do something.

SOLUTION: no

PROBLEM: Question: I just realized that I've never needed to use 31th or 31st in my four years English study. So which one is correct, and what about other alternatives? 31th or 31st 101th or 101st 1001th or 1001st Can I also use that way everywhere in the same way (for example, ordinal numbers in math)? 
Answer: The numerals with endings are merely abbreviations for the words written out as text. When in doubt, write the word out. Thirty-first becomes 31st, eleventh 11th, forty-second 42nd, fiftieth 50th, and so on.

SOLUTION:
yes