Issue #2457743 by skein: translation_remove_from_set() runs unnecessary queries to fetch and update every single node with tnid 0

Issue #1936942 by jweowu: Fixed translation_node_insert() updates the node table directly without also flushing the entity load cache.

Issue #1797366 by Lars Toomre, lazysoundsystem, dcam: Remove t() from test assertions in translation module

Issue #1408636 by swentel, c31ck: Fixed Fatal error:  [] operator not supported for strings in includes/common.inc on line 2320.

Issue #1164852 by plach: Default the 'translatable' bit on fields to FALSE for fields created in the UI, to match those created by the API.

Issue #1137074 by plach, Jose Reyero: notices and wrong links on translation tab for unpublished nodes.

- Patch #1060246 by plach: translation alters language switch links even if node translation is disabled.

Issue #988318 by jhodgdon: translation_form_node_form_alter() doc says it implements the wrong hook.

#1008628 by plach: Fixed Fatal error: Call to undefined function language_negotiation_get_switch_links() when using only one language

#915174 by sdboyer, sun: Remove pointless files[] declarations on files that are not declaring classes.

- Patch #669510 by quicksketch, David_Rothstein, Dave Reid, casey, Gábor Hojtsy, mrfelton, effulgentsia: merge administration theme with hook_admin_paths().

#878092 follow-up by sun,  David_Rothstein: Fixed Regression from D7 alpha: themes are unable to render one group of node links separately from another.

#518364 by plach, neochief, Ryan Palmer: Fixed Nodes with one language don't affect the language switcher block.

- Patch #757154 by sun, effulgentsia: base form_id() via hook_forms() not taken into account for #validate, #submit, hook_form_FORMID_alter().

#878092 by joachim, Jacine, sun: Fixed Each module is outputting its own ul.links.inline in node links.

#500866 by boombatower, solotandem: Remove t() from assertion messages in SimpleTest, so translators do not get 1000s of bogus strings.

#835212 by plach, jhodgdon: Fixed locale_url_outbound_alter() should be run only on multilingual sites.

- Patch #784832 by plach: fixed conflict with the session language provider while creating a translation.

- Patch #335035 by boombatower, Damien Tournoud, ksenzee, Berdir, Dave Reid, effulgentsia: Simpletest drupalPost() incorrectly submits input for disabled elements, causing unreliable testing of forms that contain them.

#282191 follow-up by plach: Remove ambitious parts of translatable fields UI from core that are no longer relevant, given what made it into Drupal 7.