and add 'untranslated' snippet where needed

Added documentation for methods:
  auto_refresh
  describe_transfer
  edit_address_book
  restore_deterministic_wallet

Removed payment_id input parameter from transfer-creating methods:
  transfer
  transfer_split
  sweep_all
  sweep_single

Co-authored-by: woodser
Co-authored-by: moneromooo-monero

In preparation for the deployment of getmonero as hidden service

+ update image link to markdown

+ Update version numbered and apply corrections on all languages
+ Correct typo in transfer_split example

+ add screenshots to root /resources folder

Update NiceHash guide to mine CryptoNightR & version bumped to 3.1.0 (as CryptoNightV7/8 algo are misleading)

+ rebased & updated version number to 2.1.1 from 2.1.0

+ Rewritten after other reading around original RingCT paper & 2017 update from Borromean to Schnorr
+ corrections after reviews

- Bump version to 1.2.0
- AR new screenshots (all of them were EN), text not updated: will need an arabic speaker.
- EN new `settings` screnshot, text update, bump to 1.2.0
- ES new `settings` screnshot, text update (untranslated), bump to 1.2.0
- FR new `settings` screnshot, text update, bump to 1.2.0
- IT new `settings` screnshot, text update (untranslated), bump to 1.2.0
- PL new `settings` screnshot, text update, bump to 1.2.0

- get_balance;
- get_address;
- get_address_index;
- create_address;
- label_address;
- get_accounts;
- create_account;
- label_account;
- get_account_tags;
- tag_accounts;
- untag_accounts;
- set_account_tag_description;
- get_height;
- transfer;
- transfer_split;
- sign_transfer;
- submit_transfer;
- sweep_dust;
- sweep_all;
- sweep_single;
- relay_tx;
- store;
- get_payments;
- get_bulk_payments;
- incoming_transfers;
- query_key;
- make_integrated_address;
- split_integrated_address;
- stop_wallet;
- rescan_blockchain;
- set_tx_notes;
- get_tx_notes;
- set_attribute;
- get_attribute;
- get_tx_key;
- check_tx_key;
- get_tx_proof;
- check_tx_proof;
- get_spend_proof;
- check_spend_proof;
- get_reserve_proof;
- check_reserve_proof;
- get_transfers; (including clarification proposed in #703)
- get_transfer_by_txid;
- sign;
- verify;
- export_outputs;
- import_outputs;
- export_key_images;
- import_key_images;
- make_uri;
- parse_uri;
- get_address_book;
- add_address_book;
- delete_address_book;
- refresh;
- rescan_spent;
- start_mining;
- stop_mining;
- get_languages;
- create_wallet;
- open_wallet;
- close_wallet;
- change_wallet_password;
- is_multisig;
- prepare_multisig;
- make_multisig;
- export_multisig_info;
- import_multisig_info;
- finalize_multisig;
- sign_multisig;
- submit_multisig;
- get_version;