visual - A Letter: When Sherlock meets Moriarty

After the flight, I returned to my flat, 221b, Baker Street. I knew that Moriarty was at my place. There were some muddy footprints outside my room. But not just a single person, 2 or 3 people.

I opened the door and said "Hello Moriarty!".

The reply came from Moriarty who was sitting on the chair, "It has been so long Sherlock. A year maybe."

"Any reason for this sudden meet?" I asked.

"Yes. We need to end this."

"I thought you were having fun."

"Yes. I was having fun. I have something else to do now."

"What's that?"

"We'll talk about it at my place. I'll meet you there."

Then as Moriarty left the place from that opened door, I saw a stain of blood on his shirt sleeve. Who did it belong to? Was he on a killing spree, again? I closed the door after he left. While thinking about it, I saw two notes on the table.

The first said:

I won't be in the city for few days. Please take care of yourself.

-Mrs. Hudson

And the second (which looked more like a letter) was:

The door of your flat is locked. You can open it though, by entering a word in the machine near it. But you need to solve something for that word. I have sent you a picture. Look at it. Solve it using the five basic elements of life. Earth, Water, Fire, Air, Space. Find Answer To Enter the Door.

What? These elements don't really fit in that. Use the languages, Sherlock.

-Moriarty

Now I knew about those footprints of multiple people. They belonged to the people who fit that thing on my door.

I got his message after a few seconds.

Huh? There are no numbers. Only the clues in his note. And where are the "languages"? What is the word that I am supposed to feed in to the machine to get out of the flat?

---

Update

Moriarty has sent me a message. He's probably tired of waiting. The message is:

Can't you see that image clearly?

Answer

Here is the crossword filled in:

Original Image with a color change yields this:

Then with words added you get this (unfiltered):

How I arrived at those languages:

If you zoom into the image (or change the colors) you can see the languages Welsh, Esperantu, Albanian, Spanish, and Frisian. Translating Earth, Wind, Fire, Air, Space into the language that corresponds to the Language with the same first letter yields the crossword
Espacio -> Spanish for space
Tero -> Esperantu for Earth
Dwr -> Welsh for water
Ajror -> Albanian for Air
Fjoer -> Frisian for Fire

Possible Answers:

Fated -> first letter of each word anagrammed (pointed out by @f'')
Oreo -> The four intersections of the words spell out Orea (pointed out by @Chris Cudmore)

EDIT:

Moriarty wrote in the letter that "Find Answer To Enter the Door". The capital letters are FATED. So it is the word.