l10n: Add full Irish translation (ga.po)

- Added complete Irish translation (ga.po).
- Added entry for Irish in po/TEAMS.
- Corrected email format and removed trailing whitespace.
- Translated new strings from Git 2.50.0-rc0

Signed-off-by: Aindriú Mac Giolla Eoin <[email protected]>

Author: aindriu80

po/TEAMS

@@ -29,6 +29,10 @@ Repository:	https://github.com/jnavila/git
 Leader:		Jean-Noël Avila <[email protected]>
 Members:	Sébastien Helleu <[email protected]>
 
+Language:	ga (Irish)
+Repository:	https://github.com/aindriu80/git-po
+Members:	Aindriú Mac Giolla Eoin <[email protected]>
+
 Language:	id (Indonesian)
 Repository:	https://github.com/bagasme/git-po
 Leader:		Bagas Sanjaya <[email protected]>