Spanish translation updated by Jesus Gutierrez de la Vega (#18156)

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German translation updated by Gundolf Dampf (#18157)

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Merged rails-4.1 branch (#14534).

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Removed deprecated stuff for Redmine 3.0.

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Removed unneeded :foreign_key option on belongs_to associations.

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Code cleanup, use array instead of handcrafted update.

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Add public/plugin_assets directory (#8817).

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Removed svn:ignore for public/plugin_assets directory (#8817).

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Set svn:ignore to * for plugin_assets subdirectories (#8817).

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Adds path to plugin_assets directory in admin/info (#8817).

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Fixed an SQL error with SQLServer (#14534).

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Replaced Board#topics with a regular method.

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reflect r13487 and r13488 svn:ignore changes to .hgignore and .gitignore (#8817)

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Spanish wiki_syntax.html translation updated by Jesus Gutierrez de la Vega (#18156)

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add missing fixtures to test/unit/helpers/routes_helper_test.rb

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