Fix more translations

[varjolintu]

Changes:

• Adds button titles to options page and popup.
• Modifies the names to be identical in every place.
• Removes obsolete alt properties from div icons.

Fixes #2241.
Fixes #2242

[Chealer]

Changes:

* Adds button titles to options page and popup.

* Modifies the names to be identical in every place.

* Removes obsolete `alt` properties from `div` icons.

Fixes #2241. Fixes #2242

Thank you @varjolintu
However:

1. This does not fix Options: Unclear Connect button in Connected Databases tab #2241.
2. The title is not appropriate for the above changes.
3. The alt attribute is not obsolete. It merely does not apply to div elements.

[varjolintu]

@Chealer #2241 (comment)