[Lazarus] IDE packages dialog: captions

[AlexeyT via Lazarus]

2 titles of groupboxes: Install  / Avail for installation. they mean
almost the same thing. So: rename 1st title to "Installed".

[Mattias Gaertner via Lazarus]

On Sun, 7 Oct 2018 13:43:51 +0300

Post by AlexeyT via Lazarus
2 titles of groupboxes: Install  / Avail for installation. they mean
almost the same thing. So: rename 1st title to "Installed".

To be exact: It shows the list *to be* installed, not *currently*
installed. So I guess "installed" is confusing.

Mattias
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