Stop tracking 15years.lang, remove sw and lg from contribute.lang

No point in leaving sw and lg, I just keep getting conflicts every time
I had to update contribute.lang
add German nightly firstrun
Merge pull request #110 from flodolo/contribute

Stop tracking 15years.lang, remove sw and lg from contribute.lang
Add /firrefox/desktop/tips.lang
Merge pull request #112 from TheoChevalier/add-firefox-tips

Add /firefox/desktop/tips.lang
Add firefox/desktop/tips to sl
Add ca, fy-NL to firefox/desktop/tips
Merge pull request #113 from TheoChevalier/add-ca-fy-NL-tips

Add ca, fy-NL to firefox/desktop/tips
add gl to tips page
add he to tips page
Start tracking history and history-details pages
Add sq to tips
Merge pull request #114 from flodolo/history_pages

Start tracking history and history-details pages
Enable ru for nightly firstrun
Merge pull request #115 from flodolo/ru_nightly

Enable ru for nightly firstrun
Add de to history-details
Merge pull request #116 from flodolo/de_history.lang

Add de to history-details
Add eu to tips+history pages
Merge pull request #117 from flodolo/eu

Add eu to tips+history pages
Add ca to history pages