Fix typos (#661)

Author: kianmeng

CONTRIBUTING.md

@@ -61,7 +61,7 @@ See [Translations](TRANSLATIONS.md).
 
 ### Adding translations to new languages
 
-Translations to new languages are always welcome! Keep in mind a transation must be maintained.
+Translations to new languages are always welcome! Keep in mind a translation must be maintained.
 
 * Do you have time to be a maintainer for a new language? Please see the list of [translations](TRANSLATIONS.md) and tell us so we know we can count on you in the future.
 * Check the [translations](TRANSLATIONS.md), issues, and pull requests to see if a translation is in progress or stalled. If it's in progress, offer to help.  If it's stalled, consider becoming the maintainer if you can commit to it.

README.md

@@ -1673,7 +1673,7 @@ Handy metrics based on numbers above:
 | Design an online multiplayer card game | [indieflashblog.com](https://web.archive.org/web/20180929181117/http://www.indieflashblog.com/how-to-create-an-asynchronous-multiplayer-game.html)<br/>[buildnewgames.com](http://buildnewgames.com/real-time-multiplayer/) |
 | Design a garbage collection system | [stuffwithstuff.com](http://journal.stuffwithstuff.com/2013/12/08/babys-first-garbage-collector/)<br/>[washington.edu](http://courses.cs.washington.edu/courses/csep521/07wi/prj/rick.pdf) |
 | Design an API rate limiter | [https://stripe.com/blog/](https://stripe.com/blog/rate-limiters) |
-| Design a Stock Exchange (like NASDAQ or Binance) | [Jane Street](https://youtu.be/b1e4t2k2KJY)<br/>[Golang Implementation](https://around25.com/blog/building-a-trading-engine-for-a-crypto-exchange/)<br/>[Go Implemenation](http://bhomnick.net/building-a-simple-limit-order-in-go/) |
+| Design a Stock Exchange (like NASDAQ or Binance) | [Jane Street](https://youtu.be/b1e4t2k2KJY)<br/>[Golang Implementation](https://around25.com/blog/building-a-trading-engine-for-a-crypto-exchange/)<br/>[Go Implementation](http://bhomnick.net/building-a-simple-limit-order-in-go/) |
 | Add a system design question | [Contribute](#contributing) |
 
 ### Real world architectures

generate-epub.sh

@@ -34,7 +34,7 @@ generate () {
   cat $name.md | generate_from_stdin $name.epub $language
 }
 
-# Check if depencies exist
+# Check if dependencies exist
 check_dependencies () {
   for dependency in "${dependencies[@]}"
   do