Some CSS style enhancement proposals

[dosyfier]

• Move the "dynamicEdit" span at the beginning of the "value" div to let it appear at the top left corner of the field to edit. Otherwise, the edition block may appear outside the page, e.g. if we want to edit the title of an issue and if this title ends at the extreme right of the page.
• Display the pencil icon on a field only when this field is hovered (not simply if the mouse hovers any part of the "content" div).
• Vertically align validate and cancel buttons of the edition block with the edition field nearby.
• Auto resize the issue title edition input field based on the window size (to leave as much space as possible to rewrite the title).

[Ilogeek]

Hi @dosyfier

Thank you very much for this great PR! It looks good and may resolve display issues.

Displaying all the pencil icons at the same time when hovering the block was to give the user a quick view of which fields s/he can or can not edit. (This could may be become an option to setup in the config file)

Good job 👍