Add New Merchants & Exchanges

[proletesseract]

Description

Add two new additions to the merchants and exchanges pages.

Exchanges Steathex.io https://www.reddit.com/r/NavCoin/comments/cqq8nb/exchange_nav_at_stealthexio_an_anonymous_and/

Merchants Blockashion.com https://www.reddit.com/r/NavCoin/comments/cr3rcl/we_added_navcoin_httpblockchashioncom/

Acceptance Criteria

Add any additional acceptance criteria you think should be included to the list below.

• [x] Check the merchants and exchanges actually have integrated NAV
• [x] Description is satisfied.
• [x] Changes display correctly on desktop / mobile.
• [x] Translations have been added or ammended as necessary.

[roast-nav]

Claimed :) This pr will be appended to #236 (minor ES translations) to keep things neat.

[roast-nav]

Merged