Security level screenshots

Screenshots for !70 (merged)

Add screenshots for security level.

screenshots/security-level-toolbar-standard.png is for:

• security-level-toolbar-button-standard. Shows the label and tooltip.

screenshots/security-level-toolbar-safer.png is for:

• security-level-toolbar-button-safer

screenshots/security-level-toolbar-safest.png is for:

• security-level-toolbar-button-safest

screenshots/security-level-toolbar-custom.png is for:

• security-level-toolbar-button-custom

screenshots/security-level-panel-standard.png is for:

• security-level-panel-heading
• security-level-panel-level-standard
• security-level-panel-learn-more-link
• security-level-panel-open-settings-button
• security-level-summary-standard

screenshots/security-level-panel-safer.png is for:

• security-level-panel-level-safer
• security-level-summary-safer

screenshots/security-level-panel-safest.png is for:

• security-level-panel-level-safest
• security-level-summary-safest

screenshots/security-level-panel-custom.png is for:

• security-level-panel-custom-badge
• security-level-summary-custom
• security-level-restore-defaults-button

screenshots/security-level-settings-standard.png is for:

• security-level-preferences-heading
• security-level-preferences-overview
• security-level-preferences-learn-more-link
• security-level-preferences-level-standard
• security-level-summary-standard. This is the second screenshot for this string, since it is used in two contexts. Not sure if Weblate supports multiple screenshots for one string.

screenshots/security-level-settings-safer.png is for:

• security-level-preferences-level-safer
• security-level-summary-safer. This is the second screenshot for this string, since it is used in two contexts.
• security-level-preferences-bullet-https-only-javascript
• security-level-preferences-bullet-limit-font-and-symbols
• security-level-preferences-bullet-limit-media

screenshots/security-level-settings-safest.png is for:

• security-level-preferences-level-safest
• security-level-summary-safest. This is the second screenshot for this string, since it is used in two contexts.
• security-level-preferences-bullet-disabled-javascript
• security-level-preferences-bullet-limit-font-and-symbols-and-images

screenshots/security-level-settings-custom.png is for:

• security-level-preferences-custom-heading
• security-level-summary-custom. This is the second screenshot for this string, since it is used in two contexts.
• security-level-restore-defaults-button. This is the second screenshot for this string, since it is used in two contexts.