Zanata should allow a source language different from EN_us

Description

Zanata assumes that the source language to be translated is US English.
However this is not necessary true.

For most work, when translating TO english, this is not a issue.

However there are a few places that this makes difference (other than the GUI).
For example, the glossary.

The glossary is a great place to add possible translated options for an ambiguous word. However, its functionality is diminuted when the target language is en_us.

I can see two milestones to solve this issue.

The first is to select a system wide source language.
This solves problems for local installations.
However it is not useful for shared installations like translate.zanata.org.

The second milestone is to allow a per project, per version, per document source language.
This would allow for the greatest granulaty and many db structure updates.

Just for reference, I am using my installation to translate books and texts from pt_BR to en_US and others,

Environment

None

Assignee

Unassigned

Reporter

Raul Dias

Labels

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Tested Version/s

None

Affects versions

Priority

unspecified
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