l10n of ledger advanced settings modal window

[luixxiul]

Describe the issue you encountered: buttons on ledger advanced settings modal window are broken.

Expected behavior: Buttons should not word-wrap.

• Platform (Win7, 8, 10? macOS? Linux distro?): Windows 10
• Brave Version: 0.12.5 RC1
• Any related issues: Avoid using display:table with pixels on about:preferences #2096

[bbondy]

cc @jkup pls handle for 0.12.6

[jkup]

Sorry I didn't see this one until just now! I'll have it in tomorrow.

[bbondy]

@jkup ping

[luixxiul]

On Backup your wallet window you get this:

The commit 3bb9b15 of #5705 fixes it too into this:

[luixxiul]

Test plan:

Modified 75a754a to update with the latest status:

1. Open about:preferences#payments
2. Make sure the font size of the two buttons "Add funds" and "Advanced Settings..." is equal
3. Click "Advanced Settings..."
4. Make sure each button is not wrapped

And 23207ed

1. Click the bookmark button on the URL bar
2. Make sure height of "Remove" and "Done" buttons is equal
3. Make sure "Remove" button is longer than "Done" button
4. Make sure color of "Remove" label is no longer white on hover
5. Make sure width of the row of the buttons is equal to the other rows
6. Open about:bookmarks and edit a bookmark
7. Make sure height and width of "Remove" and "Done" are equal
8. Open about:preferences#payments, click Advanced Settings and Backup your wallet
9. Make sure keys and buttons are aligned
10. Make sure font-size of the labels "Copy" is 14px

[luixxiul]

Follow-up of this: 5th commit of #6047

The buttons are no longer aligned at the center.