feat: add English translations for quests

quests/tab/en/tab.md

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+# Using Tab Completion
+
+In this quest, you will learn:
+
+1. How to complete paths with Tab
+2. How to handle multiple matching names
+
+Click the button in the middle to start this quest.
+
+---
+
+In the terminal, you work by entering text.
+Typing takes time, and a single typo can make a command fail.
+Autocompletion helps you fill in file paths, command names, and supported options, saving time and avoiding typos.
+
+Before we start practicing, let's see which files are in your home folder.
+
+> Use `ls` to list the files
+
+---
+
+This folder is full of very long and misspelled filenames. Typing them character by character would be painful.
+Luckily, autocompletion makes even long filenames easy to enter.
+
+To use autocompletion, **type part of a filename, then press Tab**.
+(Tab is the key to the left of Q.)
+For example, type `Su` and press Tab to complete `SuperSecretPlansForWorldDomination.txt`. The terminal fills in the rest for you.
+
+Let's display the contents of `SuperSecretPlansForWorldDomination.txt`.
+
+> Use `cat SuperSecretPlansForWorldDomination.txt` to display the file contents
+> Type `cat Su`, then press Tab to complete the filename. Press Enter to run the command
+
+---
+
+The terminal completed `SuperSecretPlansForWorldDomination.txt` for you, saving you from typing a long name and making mistakes.
+You can start with `S`, `Su`, `Sup`, `Super`, or even no characters at all.
+However, the fewer characters you enter, the more likely they are to match several files.
+We will practice handling multiple matches shortly.
+
+Autocompletion also helps with awkward spellings. Take `ThsisAFlieNmaeWthAloOfTpyosThatisRleayHdToRaed.txt`: anyone could make a mistake typing that!
+Use `cat` again to display the contents of `ThsisAFlieNmaeWthAloOfTpyosThatisRleayHdToRaed.txt`.
+
+> Enter `cat ThsisAFlieNmaeWthAloOfTpyosThatisRleayHdToRaed.txt` to display the file contents
+> Type `cat Thsi`, then press Tab to complete the filename
+> Try pressing Tab after entering fewer characters and see what happens
+
+---
+
+You have opened the file with the misspelled name.
+With autocompletion, typos, mixed capitalization, and random-looking names are much easier to handle.
+Let's practice again. This time, list the files inside `ThingsIWillOrganizeLaterWhenIHaveTime`.
+As before, type the first few characters, then press Tab.
+
+> Enter `ls ThingsIWillOrganizeLaterWhenIHaveTime` to list the files inside the folder
+> Type `ls Thing`, then press Tab to complete the folder name
+
+---
+
+This folder contains three files: a guide to making sandwiches and two lists of things downloaded in the middle of the night.
+The sandwich guide, `HowToProperlyMakeASandwich.txt`, is inside another folder, so one press of Tab will not complete the whole path.
+This time, let's practice **completing a path in steps**.
+
+Type the start of the folder name and press Tab. Then type the start of the filename and press Tab again to complete `folder/filename`.
+When you complete a folder name, the terminal adds `/` at the end for you.
+Let's open `HowToProperlyMakeASandwich.txt`.
+
+> Enter `cat ThingsIWillOrganizeLaterWhenIHaveTime/HowToProperlyMakeASandwich.txt` to display the file contents
+> Type `cat Thin`, then press Tab to complete it to `cat ThingsIWillOrganizeLaterWhenIHaveTime/`
+> Next, type `How` after the folder path and press Tab to complete the full path
+
+---
+
+You have read this very strict guide to making a sandwich.
+Two files remain: `RandomStuffThatIDownloadedAt3AM.txt` and `RandomStuffThatIDownloadedAt4AM.txt`.
+Their names are almost identical. They differ only at `3AM` and `4AM` before the `.txt` extension.
+If you only type the first few characters, the terminal cannot tell which file you want.
+This is a case of **multiple matches**.
+
+You can handle multiple matches in steps, just as you did with the folder path.
+Type `Ran` and press Tab. The terminal completes the shared part of both names: `RandomStuffThatIDownloadedAt`.
+Then type `3` or `4`, depending on which file you want, and press Tab again to complete the rest.
+
+_Completing a full path also takes steps: after completing the folder name, you still need to choose a file inside it._
+
+> Enter `cat ThingsIWillOrganizeLaterWhenIHaveTime/RandomStuffThatIDownloadedAt3AM.txt` to display the file contents
+> Type `cat Thin`, then press Tab to complete it to `cat ThingsIWillOrganizeLaterWhenIHaveTime/`
+> Next, type `Ran` and press Tab to complete it to `cat ThingsIWillOrganizeLaterWhenIHaveTime/RandomStuffThatIDownloadedAt`
+> Then type `3` and press Tab to complete the full path.
+
+---
+
+You have read a list of things downloaded at 3 AM. Hmm... that is enough internet for today.
+Here is a final challenge: enter `ThingsIWillOrganizeLaterWhenIHaveTime`, then display the contents of `RandomStuffThatIDownloadedAt4AM.txt`.
+Use the autocompletion skills you learned today to complete the task.