GUI merges @guimerges@x0f.org

[gui] Merged PR from hebasto: Update translation source file for string freeze (round 2) https://github.com/bitcoin-core/gui/pull/669

[gui] Merged PR from hebasto: Prevent wrong handling of `%2` token by Transifex https://github.com/bitcoin-core/gui/pull/664

[gui] Merged PR from hebasto: Cleanup translation comment https://github.com/bitcoin-core/gui/pull/663

[gui] Merged PR from hebasto: Update translation source file for string freeze https://github.com/bitcoin-core/gui/pull/660

[gui] Merged PR from furszy: Avoid recalculating the wallet balance - use model cache https://github.com/bitcoin-core/gui/pull/598

[gui] Merged PR from laanwj: Update source translations for string freeze https://github.com/bitcoin-core/gui/pull/654

[gui] Merged PR from w0xlt: Fix translator comment for Restore Wallet `QInputDialog` https://github.com/bitcoin-core/gui/pull/629

[gui] Merged PR from achow101: Disallow encryption of watchonly wallets https://github.com/bitcoin-core/gui/pull/631

[gui] Merged PR from achow101: Load Base64 PSBT string from file https://github.com/bitcoin-core/gui/pull/469

[gui] Merged PR from jarolrod: Apply translator comments to reset options confirmation dialog https://github.com/bitcoin-core/gui/pull/627

[gui] Merged PR from w0xlt: Add Wallet Restore in the GUI https://github.com/bitcoin-core/gui/pull/471

[gui] Merged PR from furszy: Reset options, notify user about backup creation https://github.com/bitcoin-core/gui/pull/617

[gui] Merged PR from hebasto: Getting ready to Qt 6 (9/n). Apply Qt 6 specific changes https://github.com/bitcoin-core/gui/pull/623

[gui] Merged PR from w0xlt: Replace `QRegExp` with `QRegularExpression` https://github.com/bitcoin-core/gui/pull/620

[gui] Merged PR from hebasto: refactor: Drop unused `QFrame`s in `SendCoinsEntry` https://github.com/bitcoin-core/gui/pull/612

[gui] Merged PR from jadijadi: If -prune=0 is set, Uncheck Prune on Intro page https://github.com/bitcoin-core/gui/pull/615

[gui] Merged PR from hebasto: refactor: Add `transactionoverviewwidget.cpp` source file https://github.com/bitcoin-core/gui/pull/618

[gui] Merged PR from ryanofsky: Unify bitcoin-qt and bitcoind persistent settings https://github.com/bitcoin-core/gui/pull/602

[gui] Merged PR from hebasto: wallet, refactor: Make `WalletModel::sendCoins()` return `void` https://github.com/bitcoin-core/gui/pull/608

[gui] Merged PR from hebasto: Drop no longer supported Android architecture https://github.com/bitcoin-core/gui/pull/614