prepare v1.2.6

doc/changelog/changelog_v1.2.6.md

+# Version v1.2.6
+
+## WoT identity
+- Fix JS error when browsing a identity (identity without certifications)
+
+## My account
+- Display a warn when distance rule failed - fix [#777](https://git.duniter.org/clients/cesium-grp/cesium/issues/777)
+
+## My wallets
+- Use 'pubkey' login method as default, when add new wallets - fix [#767](https://git.duniter.org/clients/cesium-grp/cesium/issues/767)
+
+## Cesium+ features
+
+### Notifications
+- Fix JS error when displaying a warning in the notifications popover
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