added a string directing to beta.apertium.org

[satti-hari-krishna-reddy]

Description: This PR addresses issue #361 and also builds upon and supersedes the changes proposed in PR #422.

Changes Made:

• Modified config.ts by adding showMoreLanguagesLink and specified its type as boolean in types.ts. Also, added more_languages to stringReplacements.
• Modified AboutModal.tsx by conditionally rendering more_languages based on the value of shouldDisplayString, either true or false.
• In index.test.tsx, modified a test to check if, when the About dialog is opened and showMoreLanguagesLink is set to true, it should render the more_languages. Similarly, when showMoreLanguagesLink is set to false and the About dialog is opened, it should not render the more_languages.

[satti-hari-krishna-reddy]

hi @sushain97 , could you please review my pull request? : )

[coveralls]

Pull Request Test Coverage Report for Build 7443300481

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.005%) to 97.645%

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Totals
Change from base Build 7236760780:	0.005%
Covered Lines:	1382
Relevant Lines:	1397

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💛 - Coveralls

[satti-hari-krishna-reddy]

I've implemented the changes utilizing configContext. However, I'm uncertain if i did this in a correct way. Please review and provide feedback when you have a moment.

[satti-hari-krishna-reddy]