Make editability of 100%-Matches configurable on language resource level

It should be possible to pre-define on language resource level, if 100%-matches should be locked after pre-translation.

This functionality should be integrated in the UI in what is defined in
"Define a penalty for matches" https://jira.translate5.net/browse/TRANSLATE-3198

In the grids defined in -3198 two more columns should be added:

Column headers DE

• 100%
• 100% St.

Column headers EN

• 100%
• 100% def.

An info icon in each column header should hint to a tooltip

Tooltip on the header DE:

• Sind 100%-Matches, die von dieser Ressource vorübersetzt wurden, editierbar?

• Vorgabe aus der Kunden- oder Systemkonfiguration: Sind 100%-Matches, die von dieser Ressource vorübersetzt wurden, editierbar?

Tooltip on the header EN:

• 100%-matches pre-translated by this resource editable?
• Default coming from client or system configuration: 100%-matches pre-translated by this resource editable?

Both columns should show check-boxes. The check-box for the default column should always be greyed-out/disabled.

As in  https://jira.translate5.net/browse/TRANSLATE-3198 the following grids are affected:

• Grid in clients config area
• Language resource assoc grid in import wizard
• Language resource assoc grid in task area of project overview
  => in the latter a tooltip on the 100% checkboxes should be implemented
  • DE: Änderungen wirken sich nur auf neu vorübersetzte Segmente aus. Die Vorübersetzung bereits vorübersetzter Segmente wird durch eine neue Vorübersetzung nicht geändert (weder inhaltlich noch im Sperrzustand).
  • EN: Changes only affect newly pre-translated segments. The pre-translation of already pre-translated segments is not changed by a new pre-translation (neither in terms of content nor in the lock state).